Sounds like one of my girls. Not only was she on a maintenance diet for almost a year at the breeders, but she's a slow grower as well.

The best thing to do is to give yours one good size fuzzy every 5 days. 5 day feeding intervals are great for youngsters, and it's still not 'powerfeeding'. I fed my girl her small fuzz last night and she was searching for more, so I gave her another and she nailed it. Now I know to up the fuzzy size (or give her two, since the fuzzies are FT).