Definitely some kind of topper on the ex pen. For her safety as well as your sanity

Even if you were to do it on the cheap, you could use a shower curtain and some zip ties for now, and just use the little door to get them in and out.
For chewing, someone here told me (can't remember who, this was almost 6 years ago

) to use a stick of cheap men's deodorant on any items that were being chewed. It WORKED and it did not damage the finish on the wood. Izzy was an aggressive chewer and she actually liked the bitter apple spray
Wishing you luck! I know someone here will have a better answer for your ex pen dilemma