G.B.
When she can't reiterate them when asked to go through the entire list then it's time to stop introducing so many new words and start going over the old ones.
In sign language class we each drew a sentence out of a jar and had to do that sentence. The jar had hundreds of sentences in it. We did not say the sentence out loud but had to be able to say what it was if asked.
We also did song's using sign language as our means of communication. That way we were able to figure out the movements and make them flow better.
Using exact English sign language will make her able to fully use sign language as an adult. If you teach Amslang it is time to stop, she won't be able to communicate with anyone in real life. Schools are not allowed to use it, students must speak in complete sentences and such. Their interpreters will only use exact sign too.