That's a tall order. An earlier post indicated that players make about 10-20% of their putts outside of 15 feet.
So, with the number of long putts she had today, at that percentage she would have hit somewhere between 1 and 3 of those long putts. Meaning, she could have shot as low as 68 if she were hitting them at an "average" rate.
Personally, it sounds like she was playing very conservatively today. I would guess she will do so again tomorrow and then open it up a little if she makes the weekend.