You'd better do something, FAST. Your mother can lose the home to a tax sale if the taxes are not paid. That's $150,000 of her money and your inheritance that will go down the toilet. Whoever buys the home will make $150,000 minus the back taxes as a profit. They will probably make about $145,000 on the tax sale.
Check with a bank or lender about getting the loan.
Then get someone, a TRUSTED someone, appointed as Power of Attorney with limited authority to handle her financial affairs. This should be limited to making deposits and writing checks and paying her bills from her checking account. It may be beneficial to set up an automatic payment for the loan and other essential bills. For the past 20 years or more, I've my essential bills automatically deducted (mortgage, utility, car payments) so that they are paid on time, every time. Helps credit score to when all the debts are paid on time, every time. Never had a problem