You just send it with delivery confirmation to their last known address, which would be your property.  

I found a RTA cabinet supplier through which I can replace all the cabinets with solid construction/softclose/dovetail etc for $2000 with tax, delivery, etc. included.

Be sure and send it with delivery confirmation, so you have proof they received it.

Possibly change the delivery of possession clause to make the estimated delivery date more flexible (if you can).Make sure that she knows you're putting 50% of the total cost to install carpet towards a tile installation instead.  

I've had this idea for a while about multi-tenant retail centers converting to last-mile delivery centers to adapt to the e-commerce world, and the current situation could open the door for those opportunities for creative active investors and fix-and-flip buyers who want to get some CRE exposure.

We gave one tenant work (deferred landscaping), and another we did an emergency delivery of food and pet food (partner abandoned her at onset pandemic, suffered major depresssive episode and job loss), but the fact is, everyone is paying. 

Cost more for delivery and installation than the counter.

Other times of the year - if you find out your tenant is recovering from a surgery, have a flower delivery service drop off a $30 "get well" flowers - just did that one this week.

This 60 day notice ($250 cost) was filed (proof of delivery) to tenant and her attorney back on 07/28/2020.

I'd give them written notice (which can be done with text or email, but I'd also send a hard copy with proof of delivery to whatever address you have for them) that because they have breached your written agreement by not paying you as agreed, the lease agreement is void.