It does seem as if she's being fairly reasonable under the circumstances so if you change rooms it might be OK.
I agree with Kay. Neighbours are always a balancing act, especially that almost no flats are soundproofed.
If you decide to speak to her, I wouldn't openly admit to the commercial side of things, dating or Tinder hookups instead, or just friends visiting. Or not explain yourself at all and just refer to 'making too much noise'. And never leave anything in writing that could be used against you, like a text message.
I would try to be accommodating regarding limiting the noise, moving to another room, but also stand your ground as, like you say, she's making noises herself too.