Looking on the internet deeply has found these results:

She had almost forgotten. is the most popular phrase on the web.

She had almost forgot. 1459,000 results on the web	She had almost forgotten. 11,040,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Of course, I almost forgot. The Black and White Ball. I almost forgot. This year, I almost forgot. I was having so much fun, I almost forgot. Listen, Judith I almost forgot. One little thing I almost forgot.	Because it appears at times to be almost forgotten. I hold the youngest in my arms And sing a song almost forgotten. We also continue to press for total coherence between the EU Common Fisheries Policy and European development policy, here once more almost forgotten. A thousand pardons, I had almost forgotten. We had almost forgotten about it. I had almost forgotten that unpleasant evening. This was handled without our meeting each other, and I'd almost forgotten. Just stuff I'd almost forgotten.

She had almost forgot.

1459,000 results on the web

She had almost forgotten.

11,040,000 results on the web

More popular!

Because it appears at times to be almost forgotten.
I hold the youngest in my arms And sing a song almost forgotten.
We also continue to press for total coherence between the EU Common Fisheries Policy and European development policy, here once more almost forgotten.
A thousand pardons, I had almost forgotten.
We had almost forgotten about it.
I had almost forgotten that unpleasant evening.
This was handled without our meeting each other, and I'd almost forgotten.
Just stuff I'd almost forgotten.