She's probably still adjusting to her new home, companions & surroundings. It takes time.

It is hard to tell from the pics and with all of her hair but is she overweight? Sorry if it is just me but from what I can see (again not sure because of the angle of the pics & all that hair) she appears to be a little overweight. IF that is true than loosing some of that should help her become more active.

You say she sleeps all day. Does this mean she sleeps even when you try to interact with her? Some dogs leave it up to the owners, if the owner wants to remain calm & relax so does the dog, if the owner wants to play so does the dog. I know Kaige is like that, for the most part anyways. he picks up on what I do. After all this is the way it should be, I am the leader of the pack not him, he should be following my clues not vice-versa.

Has she been seen by a vet? Thats always a good idea with any new companion regardless of if they appear to be healthy, UTD on vaccines, or even if they have seen a vet prior to coming into your life. That should be one of the first things you do with any pet that is a new addition. If you do bring her to your vets, please discuss this behavior with him/her. They may look for certain things that they may otherwise overlook on just a regular exam.

Is she really toy or food motivated? If so use that to your advantage. Entice her to play. It is possible that she may have been taught in one way or another in her previous home(s) that play is not allowed.

Keep sessions short & sweet, with some patience & love she could very well become everything you ask for & then some.