It's not up to PowerSchool to give you any type of access to her account. That would be in violation of FERPA, state and local laws. The only people who can give you access are the parents and the student. She can either give you her own login credentials or the parents can share with you the access ID and password (if the school/school district has given parents access to PowerSchool) to create your own account like they may have done.
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Thank you @DanM3 for jumping in for assistance!
@Kbwi11iams, we do not encourage students to share their access credentials to anyone. We recommend that you reach out to the school district to get further assistance on your requirement to see if they have any suggestions to meet this.