I can see where you're coming from OP - make up is similar, yet different to facepaints.
While both are to do with role play and dressing up - facepaints is about looking like a 'tiger' or a 'butterfly', but make up is to do with looking 'beautiful' - it's slightly further on than pretending to be an animal. Perhaps the OP wouldn't have been prepared to make that step had she known.
In life everyone has various degrees of what is acceptable, and no two parents are the same. It's impossible to discuss the minutiae of every parenting decision with every parent your dd meets - so sometimes you just have to shrug certain things off, esp. if you want your child to meet and socialise with a range of people.
The main thing is she had a lot of fun, didn't come to any harm, and it was all cleaned off. I'd be a bit 'hmm'
, but really, she doesn't spend as much time there as she does with you, so the greater influence will always be you.
I wouldn't worry that she'll be asking to play/experiment with it from now on (just say no - your house your rules! At this age I doubt it will be a big deal anyway, unless you make it so - as people have already said, it's just dressing up in her mind).
So...YABU to be 'pissed off', but YANBU to have some opinions around this, that happens to not be in agreement with the other parent.