Could the botox have caused a sinus infection? Did she freeze my sinuses?

It is unlikely that Botox had any relation to your sinus or tooth infections.  It is probably just a coincidence.

It’s unlikely that your sinus infection was caused by Botox and most likely a coincidence. I recommend following up with your primary care doctor or even ear nose and throat doctor about your sinus infection.  I recommend a formal consultation with a reputable and experienced cosmetic dermatologist to help you get the results you want.

Botox only acts locally on the muscles into which it was injected.  The sinuses are all bony covered and Botox does not penetrate the bone.  The sinuses of the cheek, between the eyes and forehead are all very deep and protected by the hard bony skeleton, so I think that your sinus problems are just a coincidence.  I would recommend being seen by an ENT doctor to further evaluate and work up your sinusitis.