We rented our house to a 36-year-old single mother with an elementary school child, who has owed us half a year's rent. At first, I could still contact her, and she always said she was in difficulty and was delaying payment. Later, she completely stopped responding to my messages.
At that time, my mom was traveling in Hainan, and after she told me about this situation, I said I would go check it out in person.
My mom very cautiously told me to absolutely not go alone and to wait for her to return before taking any action.