In Chapter 2, during the cutscene just before Kumatora joins the party as a permanent member, she fires PK Freeze α at Duster and Wess when they walk into the stairwell she was in, not immediately recognizing who they were. PK Freeze α costs 5 PP to use. After the cutscene ends, if you check Kumatora's status, she will have 68 PP out of 73 PP remaining.

This detail could imply one of two things:
•She had her Magic Pendant equipped increasing her Maximum PP by 5 but not increasing the Total PP she already had and that the cutscene's use of PK Freeze α did nothing.
OR
•She did start with 73 PP without the Magic Pendant being equipped and her use of PK Freeze α during the cutscene actually did drain her Total PP by 5.

Regardless of which option was intended, both still imply that for whatever reason, the developers had the foresight to have Kumatora join the party without having a full PP meter.