I am sorry you are dealing with this situation. As you probably know here is the general rule regarding neighbor trees overhanging over another's property:
A neighbor (you in this case) cannot demand that the tree owner pay to trim the branches. However, the neighbor can trim the trees back to her property line but must be careful in doing so as to not harm the tree, kill it, or chop it down altogether. If the neighbor harms the tree, she could be liable for damages.
It is in your neighbor's best interest to maintain her tree. Even though you can demand she trim her tree, you can hold her liable for damages to your property and maintenance costs because of the uncontrolled growth. This may even include taking her to small claims for amount it cost you to trim her tree.
Another avenue to is to bring a private nuisance and an encroachment action against her. Unfortunately, this would require going to court. However, by doing this a court could issue an order that she trim the tree based on the nuisance and damages it is causing your property.
Most of the time these bad situations get resolved by having an arborist trim the tree and then the person paying out of pocket has the option to bring an action in small claims to seek reimbursement.
All my best and encouragement. Thank you for allowing me to help you with your questions. I have done my best to provide information which truthfully addresses your question. Please note: If I tell you simply what you wish to hear, this would be unfair to you. I need to be honest with you and sometimes this means providing information that is not optimal. Negative ratings are reserved for experts who are rude or for erroneous information. Please rate me on the quality of my information; do not punish me for my honesty. Kindly rate my answer as one of TOP THREE FACES/STARS and then SUBMIT, as this is how experts get credit for our time.