My Mother's mobile home Intertherm gas furnace was red tagged by the gas company and it says: pilot button leak at control box. I need help badly.

Pilot button would be located on the gas valve. If that area of the gas valve is leaking you will need a complete new gas valve. You will need to contact a local hvac company to come make repairs. Once the unit is red tagged by the gas company, you don't have much choice but to call in a pro. Sorry, but you best get this taken care of quickly because your furnace ductwork in the belly of the trailer is what keeps the water pipes from freezing if it extremely cold outside. I wish you the best of luck with this, but there is no do it yourself fix.