My mother acts like im 10. (im 30) was i wrong in buying my family a safer stove?

I am a grown adult, but life has thrown my husband and i a few nasty curve financially. This has required my mother to help us.For the first time in almost a year i had to ask her to help me pay my home owners insurance. because i couldn't do it. She is financially Strapped too, which made it even harder. on any other given month i have helped her pay her smaller credit card bills.She has a home depot/ Lowe's card that i am in possession of. I charge on them, (for our house) and i also pay on them every month.(along with her other cards) This month money is bad. but while paying my bill yesterday, we found an incredible deal. a gas stove (mine is crap, only 1 burner works and you have to drop the broiler pan several times to get oven to inight.) for $280.00. she knows ive been looking and how bad ours is.. I bought it. We went to drop our daughters off at my moms, and you can tell she is pissy. She is snubbing me, only answering what she has too. you can tell she is moping or throwing her fit. She does this every time i don't do what she wants so she can make me feel bad.This is a proven ritual for her since i was little. I don't mean to add to her debt situation, but i wasn't out shopping willey nilley either. I have a family that i have to cook for safely. and good thing i bought it when we pulled our old one out and the cabinet..the was gas leaking from the gas line to stove. But she isn't talking to me this morning and when she is it is the "hoo hummm" my life is so horrible attitude. and it never fails she seems to do this to me when my husband and i are not getting along. I told her about the stove, she asked all kinds of questions. Then later in the after noon she asked are you going to go get it? so she was aware. Was i wrong in buying it? What can i do. i dont know how much of her hoo humm i can handle anymore