Estoy tan ocupada que no puedo ayudarlo.

[mnoelle]

English Translation

I am so busy that I can’t help you.

I think I’ve also seen “ayudarle.” Is that acceptable?
Thank you!

[morbrorper]

“Ayudarle” is a case of accepted leísmo. You will hear it predominantly in large parts of Spain.

[mnoelle]

Thanks so much! I have added ayudarle as an alternative response.