Feliz Pascua nieta, con amor (or te amo for 'I love you'), su abuela.
Exactly as you said it - do you want it in another language?
See related question.
Spanish - Happy Easter
Felices Pascuas
¡Felices Pascuas, Jennifer!
HAPPY EASTER! in Welsh is PASG HAPUS!
Happy Birthday Grandma I Miss You In Ojibwa
Happy Easter is 'Joyeuses Pâques' in French.
Tagalog Translation of HAPPY EASTER: Maligayang Pasko ng Pagkabuhay
Happīīsutā ojīchan. "Happy easter grandpa"
Happy easter is feliz Páscoa in portuguese.
The Happy Easter Easter Bunny - 2013 was released on: USA: May 2013