Hi there, how lovely to be able to ride western! I envy you.
However with this young horse I would just carry on using the mounting block until she is completely at ease - mounting from the ground is much harder on her back, especially when she is still just a baby.
I always mount from a block even on 14hh, and if I have to get off will try and find a rock or depression to remount. Tight jods don't help and age has taken its toll...
My humble advice is to avoid a battle and take things slow. She will come round to it when she is older and stronger.
Good luck, oh and yee-haa.