Hi my name is ***** ***** to Just Answer. I am reviewing your question and will reply ASAP.
have you made any backups recently? Have you got the cable to connect the iPad to your computer?
The steps I would advise to reinstall Mail would involve connecting the iPad to a computer with iTunes and restoring it to factory settings, so you should have a backup before doing that.
But you can try checking for updates before you need to do that.
Tap Settings > General > Software Update.
I'm afraid wouldn't be able to fix this remotely, you would need to restore using iTunes, connecting it to a computer. If you don't have the capability now then you would need to find a computer with the latest iTunes on it, you could go to the nearest Apple store for that.
I'm sorry you think so. Take my advice, that's what you need to do or you won't be able to fix it.