My girlfriend wanted to do an ‘all day sex marathon’ with me a few months ago. Should I try to take her up on it?

As the title says, my girlfriend was very horny one day and proposed the idea of us having sex all day a couple months ago. We planned this day for a trip we were going on the following week, but some circumstances got in the way and we weren't able to follow through. I was a little upset and asked if we could postpone for another time, she agreed to this. Since then, I have brought it up multiple times while she hasn't brought it up on her own. She has also recently said that she wishes I would take more control of our sex life and do more initiating and flirting to get her in the mood. I brought it up again during this talk and she said we could do it, but has failed to mention it again. I want this day to happen since I have the higher libido, but I'm also waiting for her to show some of the initiative since it was her idea. Should I keep pushing the issue and go for it or should I drop it since she doesn't seem too into it anymore (from my perspective)?