Sorry OP but you are treating your adult daughter like a child so she is behaving like one.
We bought my Ds a Cocker Spaniel puppy for his 10th birthday last August, he asked for a dog for 2 years,
he gets up on his own at 6am takes pup out in the garden, wipes his paws, feeds him, plays and watches him until DD and l arrive downstairs at 7am.
Ds has breakfast, then takes pup for 20 minute local walk before school, then l take over,
evenings Ds is responsible for feeding, letting him in and out, and does 20 mins training each evening without being told.
Today, it is raining and 3 degrees and DS and DH have gone to the woods for an hour and a half run with puppy, without any moans from DS.
Stop making excuses for your DD she is an adult, who is being unkind to you and her dog, for which she is fully responsible.
Cocker spaniels need 2 hours off lead every day, and lots of stimulation, l feel angry at your DD for selfishly getting a puppy without proper consideration of its needs.