Unaccompanied minor questions

My granddaughter (11 yo) is flying to SeaTac arriving Saturday morning ,3/29. I will be picking her up and as I understand it, will need an escort pass to meet her at the gate. Will I be able to use Pre-check or CLEAR to pass security? Given that it is spring break for many, I'm a little concerned about long lines at the Alaska counters and security.

Any suggestions or recent experiences?