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I want to think that a 2:30 2k is nearly impossible and maybe you are referring to a 500m?? My daughter is also in 8th grade and has been rowing for about a year. She’s also VERY little at 4’10" (100 pounds as well) and will likely be a coxswain long term. FWIW, my daughter can erg a 9 minute 2k which would translate into about a 2:15 500m X 4. I’m female and I can do a 2:32ish 500m which is around 10 minutes. I’m new at it and trying to get under 10 minutes, 50 year old female, and a tad shorter than you.
Here’s the concept2 pace calculator: http://www.concept2.com/indoor-rowers/training/calculators/pace-calculator. There’s also an app that you can connect to the erg – at least the PM5 that I have at home.