End of year gifts

Hello to all the amazing teachers out there. I am looking for some advice regarding end of year gifts. This year my 7 year old daughter has flourished in every aspect of life (very timid with learning difficulties) all because of the outstanding role her teacher has played going above and beyond for her special needs. Unfortunately we are re locating to another state and won't be at the school any longer. She has 2 young children and I suspect she is doing it a bit tough ( on one wage). I would love to gift her a gift card but worried that she won't be able to accept it due to the value I have in mind. If anyone can shed any opinions, tips or advice on how I can truly show my appreciation that would be wonderful.

PS. We live in QLD

Thank you!