The fact that she's eating is good. I wouldn't give pineapple as there is no real evidence that it actually helps with digestion and the sugar may be doing more harm than good.
It's also good that she wants to run around. Exercise is good because it gets the gut moving around. A bunny in stasis should be kept as stress-free as possible so it may be best to just let her run in an area she's used to.
IMO, mushy poos are better than no poos. They may be mushy from all the vet treatments. Metacam upsets some bunnies. Is she not having any normal poos at all? If the mooshy poos continue, you should call your vet on Monday. Mention that she's eating her poos too, as that's something I'm not sure about.
I would stop the Simethicone if she's eating and willing to run around. If she seems to be gassing up again, you can start it again.
Have you had her teeth checked recently?