fmil Controlling Wedding help

We are in a bit of a predicament as my FMIL offered to pay for our wedding. She gave us a budget which is wonderfully kind of her but she has made it so that every decision, choice, meeting we make is ran by her. I am now feeling that the money was offered due to control. She has already chosen our date, our venue (which she has paid for) and is now putting restrictions on our planners and florals. I am fine with having her input and feel as though I’ve already sacrificed a lot.. the date (significant meaning for her) and the venue. How do I deal with this? I don’t want to be rude or mean. But I am starting to think we need to pay for everything else ourselves as this whole dilemma is giving me anxiety and making me feel like I’m not even being heard! I should note that during the venue walk throughs it is as if I’m not even there! The event managers don’t even ask me questions anymore (In regards to setup of my vision) as she interrupts or talks over me. Now they just direct their inquires to her. A lot of other posts I’ve seen about controlling FMIL have comments like “well is she paying?” Does paying equal full control over the wedding? I thought we would at least have some say.. I am feeling like a child asking for permission and I hate that feeling. If I had known this is what it would have been like I wouldn’t have accepted the offer/allowed her to pay for the venue. What do I do at this point?