Bridesmaid BS in Ruby Woo

Hey ESB,

I'm looking for some advice - and just a bit of rant time let's be honest - about my sister bridesmaid.

So I'm getting married in about 6 weeks, but I've been planning for about a year now.
I asked my little sister to be my only bridesmaid... The reasoning of which eludes me now but I think it was just that it would be a nice, sisterly thing to do. No other bridesmaid but her - I'm not into the giant pack of women in matching dresses thing.

So my sister is the baby of the family and has always been a bit spoilt. She's about 7 years younger than me and the only other girl in my family. We weren't super friendly as teenagers - she has a wicked temper and we would have screaming matches about dumb things. But we've started getting on pretty well since she became an adult -- she sort of settled down and became more normal. We even went on a trip together.

My sister is wedding crazy - she has Pinterest boards, she loves decorating. I could see her as a wedding planner. But it also means that I think she's getting a bit carried away.

So far, I've been shopping with her and bought the dress she chose for herself. Not the colour or length I had in mind but it's her dress and I want her to be happy. She likes to self-tan while I'm a pale girl - I've always felt she looks too dark but I hold my tongue. She feels free to tell me that my flowers are crap (I'm arranging the flowers myself and posting trial run pics on Instagram); I'm hurt but I keep it to myself. She turns her nose up at our casual planned reception in a local country hall but I forge on (and hire some waiters). She wants us both to wear a flower crowns -- kind of not my style but it might look nice and she's excited, so what the hell?

But now, icing on the cake now, she's at me to hire a professional make-up artist for the wedding. No, I say. That's not my style. I want my make-up natural and I'm doing it myself. I'd like you to do it with me too, I say. We'll help each other.

So shit hits the fan. (Did I bring this on myself by being too accommodating previously??).
We have a massive argument that involves me being a selfish bitch because I know how much she likes make-up and she really wants to look perfect for the photos. Arguments about how I'm not a proper bride because proper brides get their hair and make-up done by professionals. She literally says "I know it's your day but I don't care! I want to look good for the photos so I'm deciding what I do!"

Anyhow, where to from here ESB? Dropping her as BM has been mooted but I think that would damage our relationship irrevocably. I'm loathe to give in to her though. I ask for one thing! We always look weird enough together because she's super tanned and I'm not - add her wearing full make-up and me looking plain.

Or do I keep the peace, let her go to the make-up artist on her own?

Ok give it to me straight...

Sincerely,
Not a proper bride.