Is anyone else's wife/gf gaining weight faster than average?

I've read the average woman will gain about 10 lbs this time of year due to the colder weather and holiday season. I have reports of my s/o gaining 20+ lbs.<br><br>She's 5'5" from 130 lbs during the summer to 150 lbs now (and reports of about another 10 lbs to come). She seems happy and her back issues seem to be resolving a bit.<br><br>Is this rate of gain normal? Any experiences the same?