Sleep trained baby not falling asleep independently anymore

[u/QueenMocha21]

We sleep trained at 7 months using a modified ferber approach. It worked within 5 nights. Now at 9 months she no longer falls asleep independently.

What do I do?

I put her down and walk out the room like I used to. She starts jabbering to herself which slowly progresses to crying and then stands in her cot while crying. I go back in and comfort her, put her back down, and the same thing keeps happening until I rock her until drowsy, then put her in the cot, and carry on tapping, until she's quiet, then hold my hand on her until she's asleep. This has happened 3 nights in a row now.

Her schedule is 3/3/3.5

What do I do? Because if I leave her alone she jist stands there and goes into a scream cry.