I want to know who's right here?

It's a very petty matter, but I'm still gonna ask. I have this habit of dividing everything equally among people. I recently downloaded phonepe and some other upi apps since I just opened my bank acc. My sister asked me to download these apps using her referral, so that she can earn some rewards. I downloaded all the apps using her referral and she got some money. Then, I asked her to divide the money between the two of us, ik it's a small amount but it won't be fair for me if she gets to keep everything. I, even offered her to keep extra money, only out of guilt. First, she refused but later she had to give me and ofc, she did not divide it equally as expected. Even then she acted like I'm obligated or something. She was so bothered, she was like....why should I give you? If I was in her place, I wouldn't have said that.

What do you think, who's right?