I am wondering if Polly Jean Harvey would like the idea of musical artists covering her songs for a tribute album. What would be her thoughts on that?

I don't recall her ever talking about that, but your question reminds me of a tribute album by various bands which was released in 1998:

https://www.discogs.com/it/release/7900 ... ean-Harvey

Some of them are terrible, but there are a few versions worth listening.