If she can't beat the qualifiers then she doesn't deserve to go to the Olympics. Simple as that. She definitely has the ability to win the qualifiers though. But she seems to be lacking mental strength.
For the time being, I wouldn't say she lacks mental strength.
I've pointed this out multiple times. After years of watching, Ito, Hirano and Hayata tend to play better when behind. You often see them give up a run of points only to come from behind. All 3 of them have displayed that they aren't used to having a big lead, which I attribute to the lack of experience, especially Hayata. Overall, all 3 of them have shown the clutch at various times.
Ishikawa, OTOH, tends to break down and detonate when she couldn't keep up with the score. Not just against CNT, but also Feng Tianwei, Doo Hoi Kem and a few others.