Q: If a woman becomes aroused by a thought while fasting and subsequently she gets wet, but no orgasm or masturbation occurred, is: 1) The fast nullified? 2) Does Ghusl become obligatory in that situation or is only wudhu necessary?
A: The fast does not break. Wash the area and change/wash the affected garment if necessary. Wudhu will suffice. This is on condition that orgasm did not take place. If orgasm took place then the fast will break and Ghusl will be necessary.
Moulana Yusuf Laher