I'm so sorry to hear about your husband, and I completely understand how that would make traveling difficult. This group is a great resource for finding valuable information and support.
Be cautious about people calling you regarding your timeshare in Mexico—they are just trying to get money from you. These cold callers might promise to sell, list, or cancel your timeshare, but their real intention is to take your money without providing any real help.
Unfortunately, this timeshare as most, doesn’t hold any value in the resale market. Your best options might be to either stop paying for it or try to give it away.
Selling it is likely not feasible, but by avoiding those cold calls, you can protect yourself from being scammed.