Lute- she has time to get ready for this. To get the money together for the vet, to start getting more dog food ( luckily these are not big dogs), and she has the time. Her "plan" is for you to do it- not herself. This is an adult, and has the time to act like one, and just do what is needed. If you offer too much help now other than " you have time to get ready to do this", she will not learn the planning in this- and quite frankly- I think she already knows- and just going to let you worry about the details.. ( not her.)
If this were a child or young adult, living with parents that didnt understand- I would help- but this is not the case. And obviously a repeat performance. At some point people are either willing to learn, or let someone else do it for them- whether its doing their work at work- or in this case- you take care of her dogs. I think you are being set up- ... Just tell her to start preparing now, as you can not help at this point in time, and besides- nothing is a better teacher than experience in motion- HER MOTION..