No, it isn't, but it's better than leaving the dog home all alone. At this point in her narrative, she's no shining example of responsibility, but neither is she completely complacent.
And that is why Bumblebee is the best of the Transformers movies and, IMO, the only real one. Honor the source material (though you don't have to be strict about it adherence) and concentrate on a good story. It's a simple formula that people still mess up.
She left him with an extremely protective 'uncle,' so in that she was alright. And, as I understand it, this movie is going to be about her getting beyond the pain of her past.
Best thoughts and wishes going to the Mrs. and you, @pengbuzz. Hopefully they won't have to do anything invasive, and they can get started on the chemo.
Try and keep your spirits up, for her as well as for yourself.