Ok, here is my dd's weight gain- she was not much interested in solids at all until 9 mths, and even then she barely ate.
4 mths: 13, 6
6 mths: 14, 13
9 mths: 17
12 mths: 18, 3
15 mths: 19, 9
18 mths: 19, 9
2 yrs: 21, 13
Probably more info than you needed!
I just wanted to show you that plateaus are normal! My dd went from the 50th percentile at 4 mths, to the 25th at 6 mths, to the 10th at 12 mths, then barely on the chart at 2 years!
If I were you I would go ahead and offer some solids several times a day for maybe 2 weeks and see if she takes to it, if she is ready she will EAT!!! If not, she will likely play a little with it but never really get interested in eating.
If she is devloping normal and all that, don't worry at all!