AITA for naming my sisters chickens?

I 17M was sitting at home one day and my sister brought home two boxes of baby chicks which were promptly given a temporary encloser in the form of a collapsible dog kennel they would sit in the with food and water and overtime they had grown close to me and became friendly. My sister F18 did not like this at staited that she bought them so she would decide the names. Which in my opinion were childish and didn’t suit the babys. Her names for the chicks were "bomboclat" a little black chick which was also the smallest "Patricia" "ebony" and we did a gree on one name for the biggest chick (and my favourite) "chicken little" because one day I accidentally dropped the lid of there temporary encloser on top of him (or her) . What she doesn’t know is that everyday for the past 3 weeks I’ve been training them and getting them comfortable being around humans i also spent my money to buy there feed. She only ever interacts with the chicks when she wants to do a photo shoot or has friends over. Every time she hears the names I’ve gave them she flips out about how there hers and she decides the names even though when she goes to pick a chicken up they run to the other side of the encloser. It’s gotten to the point where pengu (also known as bomboclat) the black one will sit on my hand and eat seed but when she goes to grab her she runs and hides.
How do I confront her with this because every time I do shee says im trying to "mansplain" chickens to her. Please let me know.

EDIT: last year I went out and bought three chickens when they were about young teens and would whistle every time I fed them just as a habit and also am experiment I wanted to see if they would react or squawk when I did after a few months they figured out how to escape there enclosure and I would go out into the yard and see them just hanging out. So I would grab them and put them back but everyday they’d get out and it got to the point where I have up and just fed them on the yard. The two dogs we have never chased them or tried to attack them and they weren’t leaving the yard so where was the harm? I would whistle and they would come running to me and I’d feed them and they’d hang out all day then go back to the coop and night. It was perfect until one monday morning I woke up and my mum and dad where searching around the yard I asked what happened and turns out the Neighbours dog (a known chicken killer) got into the yard killed one chicken injured another and the last one was missing. I cursed my self out for being blinded by my own little chicken farm and to not see the danger in it. But after that I started whistling and we heard a slight cawk from behind a tree found our chicken un injured and scared for life but well….. only to be eaten by a fox a few months later.
My point is I want to train these chicken’s to come on command because it’s useful and also pretty funny thats why I’ve been bonding with them. I still feel like an asshole because yes they are her chickens but if she doesn’t look after them or feed them are they really hers?

If it comes to it I could also just pay her I think it was like 60 bucks for the lot which seems like alot but these are living creatures but thats only if she really is willing to take this further

EDIT AGAIN: this is only a tiny issue even smaller than the average redditors brain (its pretty small) im not sure why so many people where but hurt by me naming my sisters chickens I just simply wanted to vent. This issue is very easy to resolve. I just don’t say my names around her. Thank you all for your input and IF anyone has chicken related question im happy to help or im sure someone else can tell you
And if you want DM me for a photo of little pengu.