The way I understood it was that marriage prospects didn't recognize her from AV. But how do you infer that she is using AV to escape?
On the cover of her AV it says that it is her debut. So I assume she started doing it recently. She probably started when her mother started looking for a groom for the arranged marriage.
Another detail is that she is using her real name, which tells me that she wants to be discovered.
Another indication that she wants to be discovered is what she says:
...What a shame.
Didn't notice, huh...
...I need to work harder!
She is saying that she needs to work harder so that she can be easily recognized as an AV actress.
So it seems to me that she wants someone to recognize her as an AV actress in front of her mother. This way when her mother finds out, she would be disinherited and wouldn't be "forced" to get married. It's definitely a plan of all times.