My MIL wants to pay for my honeymoon but is making it so difficult

I feel so ungrateful. My MIL offered to pay for our HM and originally said she was going to just give us the money and let us plan/book it. I found a cruise I wanted to take and it was on sale, so my fiance called her to get an idea of how much she wanted to give us so we could plan/put a deposit down. Now she has said no, has booked a travel agent, and wants to find us a better deal. This is all with good intention, but now my HM isnt booked and I lost the other deal. She may find a better one, but I just want to be the one to book it. I don’t want to use a travel agent. I dont want to have to go through my MIL to get the money, I don’t want to not fully understand whats happening with the booking. My fiance says she wont be controlling with it, but she always thinks she knows best and doesn’t always agree with us on what we spend our money on. I will admit I am a little bit of a control freak, but we will be traveling out of country and I don’t want to be blindsided/not fully understand all the travel info because she wanted to find a better deal/book it herself. I just don’t know what to do. I am worried every expense will be an argument, and I am the kind of person who will stress if everything is not planned in advanced. I don’t want to wait for her to deal hunt. I just don’t know what to do. I dont want to be bridezilla or be ungrateful. I was just looking forward to booking this with my fiance, and now it feels like I have to go through my MIL and ask permission for everything.