My friend has loaned my daughter her pony. She's 14.2 cob cros but has very highly withers on no top line. We had an issue with colic/grass/weight when she first came, turned out she had an infection. All is well now and my daughters riding her and she slowly gaining weight, just hoping to build more top line. I just wanted your thoughts on me riding her just a slow hack. I'm 5ft6 and 10 stone ?. My daughter is only 10 and very slight so it a big difference lol xx