Problem is, Schala as we know her was Schala under stress. She was being forced to work the Mammon Machine, and she was pretty much a prisoner in her own home. If she did survive the Ocean Palace incident, it's likely she would have been scarred for life by what she was made to do. Now, if she did recover, she'd probably also recover whatever personality she had before Lavos. The only evidence we have for what that could have been is Kid, and that might also be way off. Kid is a clone of Schala; same genes to the letter, but she was raised in a completely different environment by a completely different person, so she will have a very different personality. There has been some evidence that certain personality traits or hobbies (like choosing sports over video games) can be biological, but it almost always comes from environmental cues.
So, point being the Schala we know is likely not the Schala you'd end up dating. But hey, if you want to date her because you want to help her recover, and are ready to accept whatever personality she might develop afterward, more power to you (though if she starts speaking in a quasi-French accent, RUN FOR YOUR LIFE!)