The hallucinations will be of Anna herself, especially details like her eyes and auditory hallucinations like the sound of Anna's voice, repeating the orders. It's as if their brain is trying to rationalise the incident but as no memory or baseline to go off. Similar to PTSD
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I know I am getting a bit obsessive with my discussion of the mind control (maybe even very obsessive) but the more information you provide the more intriguing I find it.
So we know that Anna uses her powers to erase the women's memories. However, on some level, the women obviously remember something. They see her eyes or hear her voice commanding them. No wonder it takes awhile to wear off. The women must be totally confused by what they are experiencing as they really don't remember anything else that was done to them.
So I wonder too given the mind control is psychosexual if on some level the women hearing orders such as strip off their clothes might get the women a little turned on.
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It's no worries

On the subconscious level, they would remember every detail but given what we know in real life about our subconscious, that it is very hard to access. Except through hypnosis but even that is considered a pseudoscience.
It does definitely the mind control is about dominance .I would say that Anna's ability is like that to the Sirens from Greek myth. It overrides everything logic, common sense, self control and replaces it with one thought, desire. The women desire her, and will do everything to please her, they want to because its pleasurable to them.
The fact that they get turned on by being controlled is a side benefit. This reinforces the control and keeps them under. The older Anna becomes the longer the control will last.