Force wasn't actually too difficult for Emma, her magic was almost entirely raw, just pure energy under her skin. While she had to concentrate to expel it as magic energy and not just contain it, she didn't take overly long to learn how to do it.
"Um, right. It sometimes happens, and sometimes doesn't," which Emma assumed was connected to her emotional state again, but on the whole, she used it when all she wanted was to push things away, when her emotional state was directly needing her magic to work. "But I think that's partly because of how my magic works. I don't connect to anything, I just have all the magic in me. Sort of."
She'd told him how it worked for her, the idea that she was conceived in an act of True Love which filled her with magical potential. Apparently, from what she'd been told, she was potentially an exceptionally powerful sorceress.