For under £100? Depends what I was about and what was on offer really. I'm more likely to muck it up than what camera, so it would make little difference..... the film would make a much bigger difference, the lens more still...
I have to say I like my XA2, its a heck of a lot of no faff photo for not a lot of money these days; and you can pick up something pretty immaculate for under £50 and more than useful for half that.
For the faff and the IQ there are plenty of 120 folders out there, that like my 6x9 Ziess Ikonta offer a cracking lens for maybe £25 or so.
My Konika C35, offers a lot of potential for maybe £15, a fresh battery and a cotton bud. It's 35mm true focal length is cracking, and offers as much or as little faff-photo as you wish really with the overt-ride-able Auto Exposure...
If it HAD to be an SLR then the (un?)Trusty old OM10 offers an awful lot, the 'kit' f1.8 50mm is a great lens, whilst there's still a lot or pretty cheap alternatives esp if you are hqppy bto go zooms; personally with 1/4 century of experience with the things I wouldn't pay extra for the optional manual adaptor, I'd shoot the more refined 1/3 stop increment Aperture priority, watch the LED meter in the view-finder and exploit the ASA dial exposure compensation if desirable...
The more desirable single digit OM's like the 1, 2, 3 or 4 I woule avoid, especialy the battery eating #OMK4.. got one of them, done that, the 10's a 'better' camera IMO, and conveniently 'cheap'.
In similar vein, whilst I love that SIGMA MK1 M42 screw; I would probably avoid the more common East German Prakrikas.. too expensive for what they are and NOT particularly nice to use. Similarly he Russian Zenits, tyhough there IS something a bit untrangible about them, probably the bayonet sharp strap buckles and weight that might let a Russian conscript ne;;y smnaking accross no=man's land, stunn or kill a US GI in Easty Germany.. but that's another issue/niggle.. them strap buclkes on mine have certainly cost plenty of Elastoplast!! BUT buccket loads on the bay all over optimistically priced from former soviet states IMO.... I's not recommend one... prices bumnped more by the adaptor brigade buying them for that cracking Helios 44 'kit' lens.
Daughter loved her Nikon FE, but another over priced icon with the only advgantage that F-Mount lenses that may fiot it might be use on more contemprary Nikon DSLR... or vica versa ish
With a strict £100 budget then?
For an SLR, I would probably try hunt out one of the less loved, either something like my Sigma MK1 that could be picked up cos no one has heard of one. or an OM10 'cos they have always been cheap, and both take common and pretty cheap 35mm film. But I wouldn't dismis a 35mm 'compact' as long as I was clued up a bit what it was, and another XA or Konika would be favourite, and I I didn't mind blowing budget something a little more aspirational like a pop-out Minox 35.. for faff factor and ultimate IQ though I's hunt out a less loved 120 like the Ziess Ikonta or a Voiglander TLR.. and probably hunt out something like that over the Zenit like Lunitell, which is mired by layter LOMO offerings....
BUT it doesn't much matter really.
If budget had to squeeze scanner solutions into the deal... then 35mm woul be obviouse answer with a web-cam scanner, or old SCSI or parallel post dedicated 35mm frilm scanner likely eating haldf of budget and nyuthing better all of it p;lus a bit; and ALL likely the weak link in making digi-piks..... Home deb kit squeezing set up burget some more and developing chems for whatever after, even more....
If I was trying to kit out the daughter, on a skinny budget? Well any 35mm film camera, probably one of my XA's or an OM10, cos IO got em, or even a catalogue 'Halina' plastic lens compact.... then a changing bag, a daylight dev tank, and probably a C41 or B&W kit of dev Chems and a web-cam scanner, would probably take that £100 budget in its entirety and get her photo's dependent on her skill and perseverance.. so the cxamera really wouldn't be particularly big deal in the grand scheme....
Just for case example; when I did start her out I gave her my Zenit with Helios 44, a Leningrad light meter, and I think 5 rolls of out of date Kodak 100,,, commercially processed and scanned at ASDA for probably £10 a roll.. £100 would probably similarly kit you out and get you 100 photo's to look at in a packet or on screen...
So it's very very had to maker ANY particular recommend, it really does depend SO much on how important any one bit may be rated... in which #';The camera' is but a tiny part of the whole plot, to the point it probably matters very little.