Ceremony harpist

So a friend of mine plays the harp professionally. I asked her if she would be my ceremony musician. She will also play prior to the ceremony as people are being seated.
When I talked price she told me no this is my gift to you. I know that her price would be way more than a normal gift. We are inviting her and her husband to the reception. I need to give her something as this is her career- I’m getting married at a busy wedding time I hope she didn’t turn down a gig for me. She’s also setting up a special recessional that she thought of for me of a Bon Jovi song - which I use as my FH’s ringtone.
I can’t find out though what would be the cost of a harpist at a ceremony. I live near Philadelphia in New Jersey.