Geez. Wow.
It sounds like your mom is tired, like it has been said, but it also sounds like your mom lacks self-confidence, has low-self esteem, and the ability to say "no". To me, and this is just my opinion, you mom is more worried about whether or not your sister likes her (thus letting her get her way), than she is worried about her being mad for the moment when she tells her no. The kid definitely needs boundaries, and it sounds like a cry for help. I admire you for standing up and being the adult here. Someone definitely needs to. From what little bit of family history you've told us, it sounds like ya'll have lead a rough life emotionally, if not physically, so I can see where there are issues. Trust me, my step-father is an alcoholic, and I went through some bad crap as a kid, so I have an idea of some of the family issues involved. My sister was the rebel out of us, but fortunately, most of the worst she pulled was after I got married and left. That didn't prevent me from getting sucked back into the middle of stuff, though.
You do what you have to do to straighten her out. Sometimes tough love is the best thing you can do for them.
It sounds like your mom is tired, like it has been said, but it also sounds like your mom lacks self-confidence, has low-self esteem, and the ability to say "no". To me, and this is just my opinion, you mom is more worried about whether or not your sister likes her (thus letting her get her way), than she is worried about her being mad for the moment when she tells her no. The kid definitely needs boundaries, and it sounds like a cry for help. I admire you for standing up and being the adult here. Someone definitely needs to. From what little bit of family history you've told us, it sounds like ya'll have lead a rough life emotionally, if not physically, so I can see where there are issues. Trust me, my step-father is an alcoholic, and I went through some bad crap as a kid, so I have an idea of some of the family issues involved. My sister was the rebel out of us, but fortunately, most of the worst she pulled was after I got married and left. That didn't prevent me from getting sucked back into the middle of stuff, though.
You do what you have to do to straighten her out. Sometimes tough love is the best thing you can do for them.