Call your BON and see what they say about it.
"Directly" supervising an LVN is subjective-
I would be most concerned that the LVN is putting their license at risk, as it is a "rumor" that LPN's "work under an RN's license" they have their own to protect.
Medical offices are strange things--the MD can have anyone do anything and it is on the MD--
But do check with your state BON and see what they say regarding this. Also, look at the LVN scope of practice in your state. In mine, an LPN can do whatever a facility allows them to and shows competency in, except for clinically directing RN's. And since you are the only RN in the facility, clinically directing other LPN's or UAP's is something that I would think would be covered under scope. But check and see.
Make sure you and the LVN have malpractice insurance
This is not meant as legal advice per TOS, but if the LVN is taking care of patients without your direct supervision, however, then can't "circulate" it doesn't make sense.
FAQ - LVNs Supervison of Practice.
This specifically states that an LVN can also be supervised by other entities than an RN, including an MD. But be sure to call the BON and ask.