This totally depends on how high you want to take her.
I'm not there to see how well she does. You should bring her back over 18" and look at her form. If she is holding herself higher at the knees you could go higher. She would probably do fine up to 2ft jumps. Adjust her form with jumping if need be. Start her out slow not to over do it.
Not every horse is made for jumping but I see some who do jump and it's rather surprising. I had a Clydesdale x Thoroughbred mare who was amazing even though she was sooo hefty. And if you start her out slow, you should catch on and realize if she is made for it.
Btw, she looks like an Appendix or a Quarter Horse cross of some sort!
Best of luck to you and your girl! She is adorable.
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