Based on the information the principle of influence that Penny's action illustrate is authority.
Authority is a principle that can influence a person to act in accordance with people in that are in a higher position or people that has the authority to make vital decision.
Based on the information given Penny's action illustrate Authority because she trust the actress based on her status.
Penny's believe that the actress is more reliable because she has endorse the brand and she felt complying with the actress will lead to a more favorable result that using the brand her mother first bought for her.
Inconclusion the principle of influence that Penny's action illustrate is authority.
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