mil looking after lo

so my lo is 13 months and whenever i’ve needed someone to have her overnight i’ve asked my own parents as i trust them and feel comfortable putting boundaries in place (and trust they also respect these). I feel like i’m not comfortable i’m able to do the same with my mil (whose also an alcoholic). My partner had told me her drinking has been a better so for the first time i asked my mil and fil if they’d like our lg overnight as we’ve got plans this weekend which they ofcourse said yes. i then proceeded to ask my mil (so i had reassurance) not to drink whilst she had my daughter in which she called me rude for doing so and got VERY defensive over it. She then proceeded to tell me how if i expect that of her then whenever her bum needs changing whilst she has her she’ll call me over to do it and that my daughter must be ‘perfect for her’ and all sorts of nonsense etc. she never said she wouldn’t drink which makes me feel like she couldn’t handle it without one. she’s made me feel like i’m a bad and rude person for asking of this but in my head this is bare minimum for my child’s safety. we have now left of non talking terms and i feel like i need to stand my ground with this as i don’t want her to think she can get away with talking to me the way she did tonight as it was rude and no malace was intended on my side at all. i don’t really know where to go from here…