I agree with Joe on tis one. Laura and I had the same problem but for her it is her knees want let her come up on the left. I agree with a few that it is easier for her if she comes up on the bike from the right but its a pain for me to hold it from turning over. What we found works the best for us is Laura gets on the bike just likes its hers and then simply slides back, then I mount. As you already stated dismounting is not a problem for her either
David