Tenant paid 50% rent but not balance, when can I issue notice to pay/quit?

[Cynthia Oistad]

Our current tenant has had difficulty making rent payments on time the last 5 months. We have allowed her to split rent payments into a 2x a month schedule with $800 due on the 1st and $800 due on the 15th.  Thus far she has scrambled to make the rent payments + late fees but rent is typically received 5-8days late. For November, she paid the first half of rent (plus late fee) about 7 days late.  She still has not paid the remaining $800 rent that was due on November 15th (that payment is 11 days late now) and has not given us indication she can make the rent payment soon.

Can you please let me know the process in Nevada to issue a notice to pay or quit given this partial payment schedule? On December 1, she will owe us another $800. Do we issue this notice on December 1st (since November second half of rent wasn't paid) or do we need to wait until December 3rd (if December 1 rent is also not paid and late?).

We wish to end the lease with this tenant early. We manage the property remotely from another state.  Can we issue a notice to pay or quit via email or do we need to hire someone to post it on her front door?