Is AUTHOR wrong in the post ? POST : The question probably makes me sound like a dick. And it probably sounds trivial.     
  
Basically, my mum (60F) doesn't have much of an interest in makeup. She wears it every day, but doesn't care to do anything interesting with eye makeup or anything. I (31F) have quite an interest in makeup, am often complimented on it, have a good collection and skill and whatnot... however I am not a makeup artist. I do *my own* makeup very well, but I've had 15+ years practice on this face. I have done makeup on like 2-3 other people before, but one for a formal, and others just for fun... not for a wedding.    
    
Last week, my mum just flat out said (not asked), "I fly back in around midday on the Saturday, so you'll have to do my eye makeup for the wedding. I'll do the rest, but I need you to do the eye makeup, so you'll have to get yourself ready early so you have time to do it" (we are both going to this wedding). I told her I don't think I should, we have very different eye shapes and application would be completely different (hers are small and very hooded, while mine are not; we even have different colour eyes), and I've never done eyeshadow on her type of eye shape (which is notoriously challenging), what if I fuck it up? She said, "You'll just have to practice on me in the meantime". So I brought out all my palettes that night, tested a bunch shades that everything that one of us chose either didn't suit her eye colour, or her outfit, or just didn't look right in application on her. I haven't been able to do any other tests on her since I've been working and haven't really seen her much, and now she is in another city until Saturday... the afternoon of the wedding.    
    
I feel like I've been pushed into this, and I really don't want to do it because she can be a bit of a JustNo and I feel like if it doesn't look amazing and like a makeup artist did it, she will get pissed off with me and angry that it didn't turn out how she wanted. But if I tell her I can't do it, she will get angry because "It's just eyeshadow! Just do it!". I'm happy for her to use literally any of my palettes if she wants. She's done her eye makeup way more than me (which is literally that one time). I think she should just pop into a Mecca store and get them to put eyeshadow on her for her since they are trained, but she may not have the time.  
  
WIBTA if I told her I am not comfortable doing it? I feel like if I let her know now, maybe she can go into a Sephora or Mecca during this week and ask them what she should do on the day and it will turn out better. But also, she kind of expects me to do it now and she hates when her expectations are not met, and I will get blamed for things that aren't even my fault on the day just because she will be irritable.
