H.J.
Does she have a few teeth? Let her start using them! She may simply be bored with what she's getting. My little girl has always (since she started solids at 6 months) preferred bits off of Mama or Daddy's plate to any sort of baby food.
If she's always been on the small side, don't worry about it. It's more important that she stay about where she is, percentile-wise--meaning she's gaining fairly steadily--than that she move up to a higher percentile. After all, if you are going to use percentiles, someone has to be in the 1st percentile, and someone has to be in the 100th percentile. We can't all be in the middle.