Now, if I had a much more broke horse for her to ride, I would less worried, but the very small array of horses I have I feel concerned. My gelding, who is big enough to hold her(16h), has a club foot, and while it's never bothered him with riding(I'm 4'11" and 112 lbs), I get super protective of him. As well as his "pleasure" breeding, his back is a little on the longer side and I don't want to strain him much, especially since he isn't conditioned at all right now.
Then my other horse is a three year old mare. She is pretty thick and has a nice, short back and big strong hip, but she is only about 14.2-14.3. I know this height is capable of carrying larger loads as well, but I am concerned more by her age.
I'd personally feel more comfortable with her riding a larger, well...doesn't have to be larger, but stockier breed horse(say a draft cross even), but with a 7 mo old colt in hand as well, we cannot afford another horse, but are unwilling to sell/trade any of the three we are keeping.
I am conflicted because I don't want to say no to my mum and riding because I know she wants to, but her lack of will(she's very strong headed and stuck in her ways) I doubt she will be actively seeking to lose weight, keeps me worried for the horses in the long term.
Am I worrying too much and should let her ride freely or should I feel as concerned as I do? Am I just babying my horses too much(underestimating)?