I have shared w uBPDw my concerns w failure to manage emotions well. She has promised to be "good".
I would be leery about her being "good". My SO's uBPDxw began her downward spiral with the death of her mother. Remember fear of abandonment is basic to BPD. Death is the ultimate abandonment. Don't count on your wife being "good".
You might want to have a back up plan in terms of somewhere else to stay just in case.
Sorry to sound like Debbie Downer... .I would be cautious.
Panda39