Put down a reference that I had not asked, but thought I did?

veterinary assistant job description

After I did that, I emailed her asking her if I can use her for a reference. Since I haven't applied for jobs lately and my internship there had ended in August, I thought I remembered asking her, but after applying to a few places, I remembered that I didn't!

She is a super nice lady, but busy at most times. I feel so bad.

Then, what if she replies to me saying no?

I am super nervous!

Do retail stores call references? I feel so stupid.

Put down a reference that I had not asked, but thought I did?