Paying for Part B

We all know that if one is getting a SS check, the Part B is monthly premium is deducted from it, and if someone is not yet drawing an SS check, the beneficiary is billed. I just came across a new one for me. Beneficiary took SS benefits early but kept working, unaware of the $1 withheld for every $2 earned over the earnings limit. Turning 65 now, she's not getting an SS check because all of it is being withheld until she pays back the overpayment; unclear how long that will be. She is enrolled in SS and has the A suffix on her HICN. Question: how does she pay for Part B? Invoice, like s

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