If she's so well off she doesn't have to think about money, then she's being quite unpleasant not saying that obviously as she wants your hair a certain way she'll be paying for that.
I don't think it's automatic that the couple getting married splash the cash and pay for everything - but anything they want a certain way they pay for.
Just tell her very straightforwardly that you don't have the cash flow atm to shell out for all the extras, so you'll be doing your hair and makeup very simply (or not wearing make up if you don't usually - I never wear make up and won't wear it to please anyone else even if they do pay; I didn't even wear it for my own wedding because I didn't get married as a piece of theatre to please others, I wanted to be myself and comfortable in my skin as usual).
Tell her simply - due to cash flow you'll arrive on the morning, do (or not do) your own make up, do whatever you feel comfortable with doing with your hair, and yyou'll be driving back that night, at 11pm or whatever. Obviously you hope she undertands that you haven't got the cash flow atm to splash out on overnight stays and professional hair and make up, but if it's a problem you will also understand if she wants to ask you to step down.
If she's self involved and blind to the fact not everyone has cash to splash then you'll have to spell it out to her, not put yourself into difficulty to fit in with her delusions.
If she's a good friend she'll either say of course your suggestion is fine, or offer to pay your costs if it's really important to her you fit in with her plans - if it genuinely hadn't occured to her you haven't got that kind of money as pocket change!
Its fairly likely she's actually blown her generous parental budget on something ridiculous like a 10k dress and 5k a night bridal suite and 5k on flowers etc. etc. and actually can't afford the rest of her plans either, but is trying to style it out breezily expecting people to pick up costs to enable her to have her wishes even when her pot has been splurged on nonsense.