Flowering way too soon

I have amnesia haze feminized planted from seed. Light cycle for the first few weeks was about 16/8. I noticed that she had started to flower and switched to 20/4 in an attempt to reverse back to veg. Plant is getting considerably bushier but it is still developing pistils and looks to be flowering. She is only about 8 in. tall and needs to grow much more. Can I stop the flowering or am I fucked?

Also, I'm not really familiar with this strain, but it is very short and stalky. I'm hoping I see a bit more height.

Any advice would be great.

Thanks

How long has she been vegging? Usually preflowers will start to develop after around 5 weeks of veg. But if she is in full on flower you must have an auto strain. You can't stop it.

Haze short and stocky? Doesn't seem quite right to me. Maybe you ended up with the wrong beans.

Sounds like a auto flowering been like Spicey said?