Why does my female friend ship me with all her close friends and family?

Here’s some short background. My super close friend introduced me to one of his female friends at a small end-of-school event. By the end of the event she gave me her Snapchat and she started a gc with a few other people who were at the event. I didn’t use Snapchat but she encouraged me to start using it. Outside of the gc We talked 24-7 and still do, making it to the top of one another’s friends list. However, at first she shipped me with one of her friends and one of her super close sisters, who she’s sorta jealous of for receiving a lot of attention. A week or two later she was at an event with one of her friends and let her use her phone to message me. Afterward she shipped me with her too. Why is she shipping me with all her close friends and family?

Why does my female friend ship me with all her close friends and family?
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