Companion Care NYC?

Hi - I'm wondering if someone has had good experience with Duet or any other "companion care" in NYC they can reco.

My mom is 77 and diagnosed about a year ago with ALZ. She is stubborn and "presents" as independent, because she still lives alone and has coping skills to take care of herself, but I am noting changes/faster decline in her, as has the doormen in her building (I am grateful to them, as she has lived solo in her apartment for years, and so they know her well - they call me to tell me things I don't know/see). She is so much more confused, though doesn't THINK she is, talks to herself constantly, doesn't understand conversation - but smiles as IF she does. She can't track stories, is now forgetting close family member names…but she moves around her world smiling as if all is ok (until it's not - at which point, she can't formulate words/process what's happening). She is declining faster than I expected - and frankly, I feel like she would be better in an assisted living center with socializationm b/c she she just wants to chat nonstop - and nothing makes sense (so friends don't connect with her anymore, it's so sad). She wants to stay in her apartment. I am exhausted and need help - someone who can "speak my mom's language" and help her as a "companion" without my mom feeling like she's getting help. She resists anyone coming regularly but i know she can benefit from someone who can help her. So, looking for some guidance on great services anyone has had good luck with. THANK YOU for listening :)