What should I do about this situation

I recently flew back to Spain to visit my family (I used live there also but now live in the UK with my father). It’s my second night here and we go out to Marbella to have a proper night on the session etc (just drinking) So I’m out with my sister who I have always been very close with (our parents are divorced since we were young kids) and after coming back from smoking a cigarette she is paralysed drunk, I have no idea how she got like that in such a short space of time (although possible I really don’t think she was spiked, we were in a private area and she was still talking to me, just very, VERY drunk). I ended up having to pay an extortionate amount for taxi back to our house to get her home. I’m not blaming this on her I just feel a bit let down that this was my one chance to let my hair down while I visit my family and do what I wanted and I can’t even do something like go clubbing. I don’t want to say anything bad because I will just seem like an asshole. I almost feel like I sound like an entitled pr*ck, and fair if it comes across that way, I just needed to vent.

TL;DR: I don’t think this is an AITA but taking care of my drunken family when it’s supposed to be my holiday.