She will quickly tire of the un-adulterated gibberish you and your new best-friends will spout at all times.
She will be handy to help with the revision.
If she hasn't got work in Bournemouth, she will be bored out of her mind all day [and most evenings as you will be studying].
You will be limited in your accomodation choices.
How she will respond to all of the above - you know her better than us.
Some have found it helpful, some have found spouses a bit of a limit on their activities. Depends more on the relationaship itself than on the course.