"My mother recently had a double mastectomy and has poor blood circulation to the area, this can lead to infection. Is there anything she can use to avoid this?"
I have not come across any research regarding Marijuana and circulation. Consuming cayenne, ginger and prickly ash are some holistic approaches to promote healthy circulation. However, Marijuana is known to contain antibacterial cannabinoids, with potential to address antibiotic resistance. All five major cannabinoids: cannabidiol, cannabichromene, cannabigerol, ∆9-tetrahydrocannabinol, and cannabinol, showed potent activity against a variety of methicillin-resistant Staphylococcus aureus (MRSA) strains. Topical cannabinoid application may reduce skin colonization.
Hoffmann, David. "The Complete Illustrated Holistic Herbal: A Safe and Practical Guide to Making and Using Herbal Remedies."