Does my guinea pig have lice or mites? ?

Hi! I bought a guinea from a mom and pop pet store that treats their piggies relatively well last Monday. The lady I usually get them from now lives too far away, that's why we went there. Anyways, I had her out and I thought I noticed two little yellowish bugs moving through her fur. Only two. We called the pet store, and they treated her for lice AND mites. Yesterday, we combed her out with a nit brush and looked allllll over and we found not even one louse. I looked again today and also found none. She does not seem to be itching very often either. However, my concern now it this little patch near her rump that has had these little itty bitty flecks o white on it. They are only in this one area, and they are at the very base of her fur. My mom described it as a scaly patch of skin. She has had these since last Monday, if they were ggs wouldn't they have hatched by now? Do you think she has lice? Keep in mind I have a severe phobia of bugs so I might have imagined the movement. Also, she has had these little grayish crusty things just above her nose, and I removed them and they looked like boogers almost. Apart from these two things, she has been eating and playing and drinking normally. Would you say that I could deem the quarantine period over and introduce her to my existing sow? Thank you so much!!