I am not a women and im not sure if its ok to answer here, lol but when i get writers block with a sermon i pray and read the bible. However not always will God give you your next sermon, God wan'ts us to do our homework to. Sometimes we sit back and rely on him to do everything for us and the answers can be right before us. Research other pastors, learn from every resource you can think of. Compare preaching to scripture make corrections. Here are a few you should look into, regardless if its men or just women.
Topics:
The truth about the different bible versions and there corruption
The deceptions on food
What fasting really is
The truth about the rapture and the second coming of Jesus Christ
Spiritual warfare and what the Armor of God really is about etc.
Although these are my suggestions, we have to keep in mind God works in mysterious ways and can use anyone. So he may use someone to deliver a suggestion. In the end you can always pray about these suggestions and allow God to confirm them for you.
I hope this helps God bless x)