Oh poor Marigold! Prayers on the way that she will get well quickly. It's so hard to leave them isn't it? They look at you like they just can't believe you aren't taking them home with you. That is the saddest and hardest part for me too. You know you have to do what is best for them but it hurts like the dickens when you look into those eyes.
The good thing is she will be home soon and she will feel better. That had to hurt having an abcess in the ear. They hide pain so well.
Hang in there meowmie and keep us updated.