She does look like a sweetheart and for trail, personality is very important as long as her basic conformation is sound. I don't know if it's the angle of the picture but compared to her front end, her hind end is much smaller. She has a very deep heart girth/chest, shoulder angle isn't bad. Her neck is set pretty low on her shoulders, front legs are short with straight pasterns which will make her gaits more jarring, kind of hard to tell if her back is long or she just needs more weight across her loins, her head looks large in comparison to her neck and she looks like she's got low muscle tone. Is she an appy? If you vet check her and she's sound, you enjoy her, why not? I'm not so sure I'd be breeding her though. Plenty of horses with great conformation out there to be had for less money.