Use the Scheduling>Time Tracking>Views>Call Details to see what phone number was used for the attempt and what time the call was made.
Make sure that the phone number she used is marked as "time tracking". This could be either the client or the caregiver's phone.
If the number is time tracking, check to make sure that the call was made within the time threshold set in the office settings.
If the phone was time tracking, and the call was within the time threshold, and the caregiver called from his/her own phone, make sure that the client profile allows clock in/out from caregiver mobile.