Kyle Glover, 11, was declared brain dead last week following a jet ski accident, but Tameka has not lost hope that her son can make a drastic recovery, reported TMZ.
Sources close to the family said she is telling friends that she still believes in miracles.
But Tameka can only keep Kyle on life-support as long as her insurance company agrees to pay, otherwise she doesn't have the funds to cover the enormous hospital bills.
The insurance company hasn't set a specific deadline, but they've made it clear they're only willing to shell out coverage for a couple months.
Sources say that Usher, who helped raise step-son Kyle for several years, has been supportive in this difficult time but has not offered to pay for any medical bills.
Kyle was struck in the head by a jet ski while inner tubing on Lake Lanier -- doctors declared him brain dead days later.
