You can sue the neighbor for nuisance.  Nuisance is a serious and unreasonable interference with your use and enjoyment of your property.Although you could seek damages (monetary compensation) in your lawsuit for nuisance, that would be an inadequate remedy due to multiplicity of lawsuits since this situation is an ongoing and continuous problem.Therefore, since damages are inadequate, you can seek an equitable remedy in your lawsuit for nuisance, which would be an injunction, to have a court order your neighbor to keep her tree trimmed.