There was this one patient who asked for my phone number because she said I was very good with her

At first I was reluctant because it's enough to just say thank you since it's my duty anyway and I won't take anything extra because it'd be unethical, but she was insisting and even asked the head nurse. Now she's out and called me and said she'd like to meet some time to thank me. My mum says she might be someone important who wants to reward me because she wasn't reveiving enough attention from the rest of the staff (she was struggling a lot and some of them are really desensitized). I'm curious but I don't want it to be awkward, if it's just for a coffee I can accept it but some gift it would be too much.