How to refuse a gift without looking rude !

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Help !
I recently did a favour for a friend or a friend, her wedding flowers. (I was a florist while at uni) I offered as i knew she was having a low key wedding and on a tight budget. Loved doing them, I have a very corporate career now and really miss being creative. When I dropped them off for her she was very appreciative, gave me a huge hug and handed me a card. I left feeling happy that I'd done a good deed. When I got home I opened the card to find cash, more than I paid for flowers wholesale. I immediately messaged her saying, you've given me too much money for the flowers- Send me your bank details and I'll wire the difference. Her response was no, that's a gift from us to say thank you !!! And can I send her my bank details to pay me for the flowers. Is it rude to not send my bank details?! I really didn't want or expected to be paid for doing something fun. But I don't want to be rude either !!! Help what should I do ?! 

CHoose to pay it forward if you really don't want it - thank them and find something useful to do with it - how about microloans to people setting up businesses in the third world....

Oh come on, this is Mumsnet - you're supposed to be outraged that she's taken advantage of your good nature, undervalued your talent and didn't even invite you to the wedding

Seriously though, accept the money, thank her but say that you've already been paid enough and that if she really wants to then she can make a donation to X charity, but absolutely doesn't need to.

Thank her, refuse to give bank details tell her she's already more than covered your expenses/flowers and you really enjoyed doing them and your time was your gift to her, and she wouldn't want to return/pay for a gift would she! You both sound lovely which is refreshing on here.

She's sent you the cash and wants to pay again via bank transfer?

Either way just accept it with grace. Pay for dinner or something

To clarify, she asked for my bank details to pay for the flowers I collected before I even started her flowers this morning but I've been busy and forgot.
She gifted me £100 as a thank you for doing the flowers.
And wants to pay her 'debt' for the wholesale blooms.
Gorgeous girl !