Future mil is mad because i hired a florist

Hi, all. This is my first post. This is going to be a little long. I am having some difficulty with wedding planning. When we first got engaged, fiance's mother didn't show much interest (probably because there were other people around). When we next saw her (alone this time) she showed a little more excitement and offered to do a few things for the wedding, such as make bouquets and help with decorations. I was thrilled to have some support, but things have quickly gone down hill. She refuses to look at any of my ideas and ignores me completely (either by not answering at all or by changing the subject). I printed a wedding timeline that has tasks for each month. I'm falling behind on tasks because she just won't cooperate. She does occasionally send me pictures to show me what she's done (not our style, and I try to politely tell her this), so it seems to wants to help, but only if she can take completely over. Am I wrong to go ahead and buy some of our decorations on my own, or to go ahead and hire a florist? I'm tired of trying to get her to work WITH me, only to be ignored. I didn't ask for her help in the first place.