If you're enjoying yourself, simply say " This is fun! We should have done this before".
Mess up your hair, splash some water on your face (to look clammy) and tell her you have the flu. Keep the phone close to your face so that nothing else in the background is showing, except a pillow.😥
Tell her that your cat ate a bunch of tuna, got fat, sat on your computer and broke the camera lense.