I would like to know what "The most they can get from her" means in the following sentences:
It is a few moments before the waitress regains consciousness. She is, it appears, uninjured, but whatever she has seen out there has struck her nearly mute. The most they can get from her are low moans, wordless nonsense.
‘I sent her over to the Folly for a couple more bottles of champagne,’ the head waitress – only twenty or so herself – says helplessly.
- Lucy Foley, The Guest List, Chapter 13
This is a thriller novel published in 2020 in the United Kingdom. One hundred and fifty guests gathered at some remote and deserted fictional islet called Inis an Amplóra off the coast of the island of Ireland to celebrate the wedding between Jules (a self-made woman running an online magazine called The Download) and Will (a celebrity appearing in a TV show program called Survive the Night). The wedding ceremony is held at the Folly, which is a renovated castle. On the wedding night, after several times of blackout, a waitress screams outside before entering the marquee, the party venue installed on the island, and guests are now all gathered to see what happened.
In this part, I am wondering what "the most they can get" means. Is it similar to say "the best thing they can get"? Or "as many words as they can get"?
In short, I am finding it difficult to understand what "the most" means here.