The funny thing is, this is a sweetened version of what the developers initially intended to do. The last Lisa path update was postponed one month because they redid it, as they though Haley was way to much mean to Lisa (link).So, I reloaded my Haley+Lisa save and ended it shortly after. Here's why: Haley is always angry. So, she turns into a total bitch towards the MC and Lisa. Bossy and just completely unbearable. Now, some might like that, but I don't. So, I deleted that save. So, unless you like that sort of thing, there's really only 3 paths. Haley solo, Haley+Adriana and Haley+Sandra.
That's also why I put this path way lower than Sandra and Haley-only in my preferences; first, because I'm not the ultimate fan of Lisa, but also because I don't like how it changes Haley's temper.