I think from general structure she looks like she should be putting out lots of pistils but I can't see many. Must be a very frustrating situation to say the least
I'm not certain tbh, I would expect to be seeing preflowers before switching to a 12/12 schedule in normal cases and it would vary strain to strain so I'm unsure how long it will take to trigger full bloom.
Have you tried a high P-K feed with some bloom stimulants or something?
Another thing I've read about is a light flush with some 1/4-1/2 strength P-K feed which serves a similar purpose but also washes a bit of the crap out basically
Otherwise if I was you, I would be prowling some of the photoperiod sections and find some people with a bit more experience because most of mine with photos is secondhand
Good luck buddy