I'm a lefty too :)
If there is a fear of cutting herself.. and the klutz glove isn't feasible, she could try the suction cup handles.
Her hands will definitely be out of the way.
Without physically seeing it myself..
I'm in agreement with others.. not enough pressure.
Perhaps her positioning over the cutting surface doesn't give her the proper angle to apply adequate pressure?
I hope she's able to find a comfortable way to successfully cut her fabric!