I don't know whether she will or not but she does have a shot. Only the best 17 tournaments will count at the end of the year. So, Rena just needs 16 more.
In fact, Chrissy already has 5: 1 GS win, 1 Tier1 win, 2 Tier2 wins and 1 Tier2 SF. Impressive, isn't it?
Rena will have to match her in those 5 performances, then do better than her (over all) in the other 12. Not an easy feat, but possible.
There are 3 GS's left, 7 Tier1's, 10 Tier2's and WTC, that's 21 good tourneys to choose 16 out of. If Chrissy starts faltering and Rena keeps on rumbling, the latter might not even need all 16 tourneys. Two GS wins alone can go a long way.
Realistically, I don't see Rena playing more than 14 additional tourneys. She will have to make them all count