If paying cash, have her put you on title as at least 1% owner, so you will qualify for the homestead exemption. Here in Indiana that will cut your taxes in half. If getting a mortgage, she will have to wait until after closing and quit claim 1% to you... same effect! Good Luck!
Is she planning on getting a mortgage or will she pay cash? If she is getting a mortgage, she will have to purchase the property as an investment property. As an investor, she would probably have to put 25% down. If she is paying cash, this is not an issue.
Another option, depending on your credit is that she can co-sign. However, you credit would have to meet approval.
Consider talking to an attorney and/or an accountant. Will the house be in your names, or all three? Are you going to get a mortgage? If you are then how you structure the deed will be affected as well. Living out of state is less of an issue. She will have to qualify for the mortgage however. For this aspect speak to a mortgage professional.