Does my gf have PMDD?

Over the last 4 months I’ve started noticing a pattern with my GF33 where the week before her period she starts withdrawing and taking space for days where it seems like the relationship is over. Once her period

Starts it seems she comes back and things are pretty normal until the cycle repeats. It’s happening again right now almost out of no where, again. We do have our problems but they seem to amplify at this point. If she comes back in a couple days, it’ll be the 4th month in a row where it has happened.