Family, 2 puppies, and hard truths🥺

For context, my family of 4 just adopted 2 Dalmatian puppies from the same litter born aug 31st. We’ve had many dogs before and our last two dogs were also Dalmatians. However, we’ve never gotten them so young and we weren’t exactly expecting walking away with two. That’s where the dilemma lies. We found out about sibling syndrome the night after picking them up and scrambled to get the girls separated and in different places with one dog living and being raised by my parents and the other with my sister, who lives in the same building as me. My sister had been talking about wanting a pet but has a very busy social life, a new relationship, and has a habit of entertaining ideas without fully thinking them through. She’s doing an amazing service to our family and the dogs stepping up to the plate of raising her but is rightfully feeling frustrated at the imposition a puppy places on her ability to hang out and have her own life. We’re trying to help out as much as we can but she’s refusing to cancel a majority of her plans till spring so that she can prioritize the dog and we don’t know how to explain properly to her the sacrifices one has to make to raise a puppy so young. What can me and my family do to help my sister while simultaneously making it clear that she too needs to get serious? Any help or advice would be greatly appreciated. Thank you!