Depends on the park it seems for us. Like Epcot with Flower going on was a zoo, but 2 weeks before was dead.
I actually managed to get Mine Train fast passes for the MK day she is going. So I think it will work out well. There was no FPs yesterday, but today when she was looking she found them. We are going in the evening and meeting up with her, so I said I would get them and we can do child swap and therefore all of us will be able to get on. I did that with Thunder, Splash, and Mine Train. Then they are going to get their passes early in the morning and maybe be able to get a 4th and 5th. They also plan on going back to the hotel for lunch and naps. Which since she is staying at Poly will be really easy for her.
They are staying at Cabana two nights, but couldn't get Friday there, so they are doing one of the other 3. So the other 3 have Express, would she be able to get Express for Friday and Saturday? Only Saturday? She checks in Friday, out on Saturday and into Cabana on Saturday. Also, how does express work? Anyone on her room reservation gets express? Is it passes or room key? She wasn't sure how all that worked. If she has express on Saturday I will probably meet up with her on Sunday since we won't have express. But she has a suite so she wasn't sure if she could add us somehow to express. But I doubt it.