Have you tried a bouncer or activity center yet? They definitely go through a big fussy phase at that age. It was helpful to get out of the house a lot and see new things. It sounds weird but they start getting bored inside. Fresh air and new faces can sometimes do the trick.
Google wonder weeks . She may be going through a Leap . They have an app as well that tracks Leaps and gives you information on what your child is going through . I'm currently going through a leap with my son and he's so clingy and fussy sometimes