S.N.
What you're doing is illegal b/c she is not a 1099 (independent contractor) she is a W2 employee (you set her hours, tasks, etc.)
You need to get an EIN number (Employer Identification Number), take taxes out, match those taxes like your employer does for you, file those taxes on a Qtrly basis and in some states (MN is one) carry Worker Compensation Insurance on her.
We did all of the above for our nanny and used a GREAT service out of TX for all the taxes. They worked out her net pay for us, drafted the taxes (both ee and er) out of our bank account, filed all Qtrly. reports and produced her W2. I HIGHLY recommend them -- Breed Love. They specialize in Nanny Payrolls.
It's about 2X the cost of daycare to have a nanny... most people don't realize that.
P.S. Sherry and Grandma G.... your employer (past employer) is in the wrong. Sherry, unless you come and go as you please and set your own days/hours you are not a 1099 (you take care of your taxes) you are a W2. They are taking advantage of you and it is a state and federal crime punishable by fines.