end of life care

hey y’all, this is my sweet girl nana. she developed a respiratory infection about two months ago, was on baytril and doxy and it seemed to clear it up but in the past week she’s been incredibly lethargic and today when i went to pick her up she just went limp. she’s about 2 years old, so it’s probably her time but i don’t know what to do to help her. i’ve got her cuddled up in a hut beside me with some oatmeal and water but she can’t really move around to get either. i don’t know how long is inhumane to let her feel like this in hopes she’ll just pass peacefully at home… should i make a vet appointment for euthanasia? i just love her so much and seeing her like this is breaking my heart