Sorry for your loss. She's now with you all the time.
I started typing my answer with my cat Pixelle on my lap (she just left). Being often in front of my PC, she actually comes at least 2x per day during 10 to 30 minutes on my lap, during some period it's less, but she's very affective and i noticed that she needs this and also need my attention. What i want to say is that if Luna spent 16y with you this is a great gift that you gave her, what the vet of Kari Baba said is true, you allowed her to live longer but also probably help her to progress on the spiritual side.
I can't help to regularly think about the day this will happen for Pix, who reach 10y old recently (already 10y ! time went so fast). I dread this day, I dread the days that will follow this day as my relation with her very strong, she's my little sister i often tell her and as i live alone with her and no other 2D friend/brother/sister, I feel guilty on the rare occasions when I go on holiday.
God (or the cosmic mind) bless Luna, my sincere affective toughts for you Seppo and to Luna too.