Are these lumps near jab sites?
I don't know if this is it but insulin causes fatty lumps on type 1 diabetics if they put the insulin in the same place every day hence the need to rotate sites daily. Its called lipodystrophy. Because she is so little those bumps might be a lot more noticeable. No other symptoms except that it would mean less insulin getting absorbed hence higher sugars.
Hope you and she are doing okay with the whole thing anyway!