Don't know if it means anything, but she drinks a lot during the vomiting phases.
Drinking a lot of water and vomiting immediately (if that's what she's doing) is a sign of stomach acid. From Tanya's website:
"Vomiting Water
Sometimes CKD cats drink a lot on water in one go, then vomit all or most of it up shortly afterwards. This may be a sign of excess stomach acid. It is possible that the cat has an urge to drink before vomiting so as to dilute the stomach acid.
Vomiting in the Morning
CKD cats often vomit in the morning. This tends to happen because if a cat goes a long time without eating (such as overnight), excess stomach acid has more time to attack the stomach lining and cause vomiting."
More from there. Not sure if it's of any help:
"There is a difference between vomiting and regurgitation. Vomiting is usually accompanied by a lot of abdominal movement, whereas regurgitation happens suddenly and with less warning. Vomiting means the cat is emptying the stomach, whereas regurgitation is where food has not yet reached the stomach but is being ejected from the oesophagus more or less intact, often because of eating too fast or hairballs. Regurgitation is often sausage-shaped.
Veterinary Partnerexplains the difference and has videos showing vomiting versus regurgitation.
Cats who vomit immediately after eating may have a gastric motility problem -
ranitidine may help with this, but is now extremely hard to find.
Occasionally vomiting is caused by
constipation, particularly if your cat vomits before, during or immediately after using the litter tray.
If you are giving your cat sub-Q fluids and s/he regularly vomits after fluids, this may because of the
type of fluid used."