Good advice from Karla. Some things are just beyond guess work and need to be checked out. Hope you take her in.
Hello & welcome to the forum......Excessive amount of water drinking is my first concern here....This is an early indication of "Somethings Not Right"!
Diabetes, Kidney Disease, Liver Disease, Cushings Disease are a few diseases that one symptom is excessive water intake....This alone, should get her a Vet check....If she hasn't had a Blood Panel done in the last year, she needs one.....The earlier these diseases are caught, the easier they are to treat.....
Next, The fact she can't keep anything down is also a concern. Blockage comes to mind and can be fatal if left untreated......
If she's eating ALOT of lizards, maybe they are toxic & this is causing the problem....
Either way, because of all the symptoms you describe, she needs to be evaluated by her Vet....I personally, would not wait long to get her in.....IMO, she needs to be seen ASAP...Please, make the call & be sure and come back here to let us know how she's doing.....I hope she feels better, soon.......Karla