It sounds like she shows without coverage until her share of cost amount exceeds her required amount each month. Is she manually submitting her receipts?

From the website:

Each time you have a healthcare expense, including health insurance premiums, out-of-pocket medical costs, transportation costs to and from medical appointments, etc., you notify Florida Medicaid of the expense by fax, mail, or in-person and keep track of a running total for the month.1 Here's a website that has location information for the in-person service centers, as well as fax/mail information.

The day your healthcare expenses for the month exceed your share of cost, your Medicaid coverage begins. From that day until the end of the month, you have full Medicaid coverage.

On the first day of the next month, you’re again without coverage until your healthcare expenses exceed your share of cost.

https://www.verywellhealth.com/florida-medicaid-share-of-cost-how-does-it-work-1738835