She wants to bring forward the time of her menses to Ramadan, because she is going to get married in Shawwaal
Question

The time of my wedding is going to coincide with the time of my monthly period, which is not suitable. I went to a female doctor to change my menstrual cycle so that it will come before my wedding, but that means that it will come in Ramadan, which will result in my breaking the fast for more days than is usual. Is there any prohibition on doing that?
Praise be to Allah.It is permissible for a woman to take medication to bring forward the time of her period, if the intention behind that is not to use a trick in order to avoid fasting in Ramadan, and so long as that will not result in any harm for her.
Please see the answer to question no. 156110
I put this question to our shaykh, ‘Abd ar-Rahmaan al-Barraak (may Allah preserve him) and he said:
It is better to leave things as they are, and to inform the husband of that, and he may enjoy intimacy with her in the ways that Allah has permitted, without having intercourse.
But if you must do that, then it is permissible for her to take medication that will change the menstrual cycle, even if it is brought forward to the month of Ramadan, then she may break the fast but must make up those days. End quote.
And Allah knows best.