I am not sure I was busy working on another project we got her. I couldn't stop my oteher project. The good news though is that I got her from a good friend that tought me about everything I know about horses. I have known her (my friend) for 3 or 4 years and she has had her that long I know that but she probably is a bit older. She is trained bareback, western saddle and also she was a barrel racer. My friend knows this horse very well.
I am sorry, but her current condition appears to be that of a still growing and filling out baby, not a mature horse of 4 years of age or older, so if that is her true age she is underweight/underdeveloped. She'd benefit greatly from a good balanced nutrition program and some conditioning work to bring her back to a better place before you are asking much of her.
She is pretty chubby as it is I think my pics are misleading you. By the way I messed up now that I think about it she got her about 2 1/2 years ago. And I am pretty sure she got it from her brother whom trains horses. She does need to get out more she is barn sour of about 6 months. I am not trying to say you don't know what you are talking about but I know she is in healthy condition other then she has a small problem which already has been checked out by a Vet and said she will be ok.
Have you had her vetted - either PPE or since you brought her home? The vet can give you some idea of what sort of age range she falls into based on teeth, etc - it isn't exact, but would be helpful. Plus, a vet check will help to let you know if there are any underlying issues that addressing would help you in the effort to bringing her back to a better condition.
I haven't gotten a Vet out here yet. My nieghbor use to be a rancher he can tell me when he next comes down here. I have only had her for a couple of weeks. Again I can get ahold of my good friend and she knows I think my mom and sister just didn't think to ask and I wasn't there to ask she knows I have alot of questions for her. I just need to get time to get ahold of her. I know I will need to work with her to get her back into shape as far as being ridden but I can deal with that my previous horses were not broke and I was breaking them until somebody poisened them. (2 were not broken, 1 had problems where she liked to kick, and the other 2 had no problems just really old and one of those 2 had thrush problems badly.)