Tenant walked no notice - Texas

[Stacy Eisenberg]

I live in Texas. We have a tenant who texted us last week stating that they have moved out and left keys and garage door openers on the counter - no notice and with 5 more months on their lease. She did not provide a fowarding address and has said that she feels her deposit will constitute the next months rent (as if she had given 5 weeks notice). We have been lucky and have never had to deal with this situation before. What is the proper procedure to take with this? Do I have to file for eviction? Will her text support abandonment? Do I simply tally up the costs, mail the letter certified to her last known address (our rent house) and then try to file in court? Can I file in court without a forwarding address? What suggestions do you have? Anyone with experience (especially in Texas) with suggestions are very appreciated.