Hi Chasie
I presume that you want to provide her with a full loan to help her buy a house.
You envisage that she would repay this loan.
There is nothing to stop you doing this.
After you give her the loan, you can also take out security for the loan by "mortgaging" her home. This means that you can repossess it if she fails to repay the loan. I am not sure if this is necessary, but you should do up a short contract clarifying that it is a loan and not a gift.
I think you are better making it an interest-free loan. Otherwise, you will pay tax on the interest received while she will not get much tax relief on the interest paid.
If you have enough money to give her a loan, do you have enough money to give her an outright gift of cash and just let her buy the house? It would be simpler. But then it might be good discipline for her to repay the loan.