Ah I see what you mean. Personally I took it to be a generalisation of friends and partner who were the last to have known her movements: ie one friend who was with her until 9pm, and her partner who spoke with her until 9:28pm. It’s been reported that the partner raised the alarm to her friends due to a no-show/no contact re their planned meeting on the 4th and then the friend(s) raised the alarm formally to the police around 8pm that evening.
You’re right in that some info could be being withdrawn (ie I’m not sure we know the gender of the friend in Leathwaite and whether this has any bearing on the nature of the call with the partner, though allegedly the nature of the call was pleasant - how was your day, let’s meet tomorrow, etc. but we only have one side of the call for that). But at this point, I’m assuming it was the partner who last heard from her, though of course we shouldn’t rule anything out. Hopefully her phone records can be recovered or have been.