Hi and welcome! Stella's so pretty! Does she have 1 blue eye or are both blue? We have a member here who has a bully here with one blue eye.
8 months is a good age for spaying. Unfortunately, instances such as what Lola went through do happen but the chances are small. Do you know what anesthesia your vet is going to use? It's recommended that they use isofluorane gas. That's all I know about surgeries. Hopefully someone here will share their insight and experience.