I think Mao should change the 3Lz to 3S. Her 3S is a thing of beauty and would definitely garner her high GOEs.
I don't think she'll do it. Mao's initial plan for CoC was 3A, 3F-2L, 3L or 3A, 3F-3T, 3L (if her condition was good). However, she decided to switch to 3A, 3F-3L, 3Lz because a) that was her long-time goal since she started reworking her jumps, and b) she needs to keep on putting 3Lz in her competitive programs to make it stable. She said she already feels comfortable about it in practice, but it might take a couple of competitions more before her brain stops defaulting to the older technique while jumping within the actual program. The same thing happened when she was reworking her other jumps.
Here's her 3Lz in practice at CoC: http://i.imgur.com/KDfvsqu.gif
It's been steadily improving since the off-season, so here's hoping it gets even better by Nationals/Worlds.