Tenant and Rent

[Melissa Rivera]

Hi,

I am new to the game. I need some advice on a situation.

I have a section 8 tenant who did not pay rent, was served a notice to quit by a Marshall. And then she had money to send.  I asked her to send it certified mail and did not comply with those directions and sent it regular mail for her late rent. 
If I do not receive it what do I do? 
Does the notice to quit continue?
Or is that taken as an act of “good faith” on her word.  Even though I did not receive it?

Thank you