Please more of history. Any other complint?
For 2months 14hours and even more more sleep is normal. Sleep is a super power. So let her sleep, unless any fever or any other complait.
Next Steps
Sleep is supper power for development of brain.
if there is no more of complaint, relax. She will make it up.
Don't forget immunization.
Good nutrition with greens',banana, egg, sweet lime juice