Yamato has definitely done enough to join the crew, so I voted "Yes"...
However I don't think the subject here is really about her joining the crew, rather it is about a recruitment.
Problem : Yamato had such an exposition in Onigashima, that it is VERY unlikely that she could have another in another arc. Usually Oda prioritize one or two strawhat per arcs. So... Yamato's time is now or never.
Did she do enough to join the crew? Yes
Did she do enough as a future strawhat to be recruited officially? No