Eyebrow Droop After Botox? (photo)

I just went to the doctor and got my injection sites from her. I am 37 years old and was injected in July at 4 sites at the top of my forehead and in my eyebrows as well as the crow feet area. I was injected more than 2.5 units. In November I was injected the same places just no more than 2.5 units. It looks like she has been consistently injecting my eyebrows. Will this cause my brows to remain droopy even after the Botox wears off since it has been 2 years? Brow ptosis first began around Sept and has gotten much worse after Nov injections. Thanks.