First horse in 20 years- Polish Arab - advice appreciated

[cornishcat]

Hi there
I'm new to this site though not to riding. My husband is a trainer and we have several horses but I haven't ridden or owned my own horse in 20 years. I've acquired a Polish Arab (by default really, a friend has had to give her up due to illness) and we said we'd take her on. I'm somewhat nervous due to a fall I had when I was young but this horse and I get along beautifully, she follows me verywhere and I've taken on her full care. I'm totally smitten. Just one small niggling doubt, I'm 5'7" and weigh 150lbs and the horse is just 14.3 hands. Bearing in mind that this breed are bred for endurance, speed and carrying soldiers does anyone believe she's too small for me? I suppose I'd look better on something taller but she's within my comfort zone!
Sorry to babble on, really would like feedback if anyone has a minute.
Thanks for reading