Hi Leslie
A few questions...
How long has Minnie had the new toy?
Has the eating issue only started when the new toy arrived?
Is Minnie eating anything at all?
What about drinking?
What are you feeding Minnie and have you tried alternatives?
I would not worry too much about the attachment to the toy as such (unless that IS the reason for the eating issues). Our Border Collie boy 'Taj' has an attachment to a stuffed toy (lambie) and has had it since he was a young pup, it is his toy and he keeps dragging it around with him

Hope to hear from you soon with more details of the above and I am sure others here will offer some advice as well.
Cheers
Greg