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Wendy is portrayed as more level-headed and mature than her peers, often getting good grades and protesting world issues. For example, in the episode "Breast Cancer Show Ever" she writes an essay in regards to breast cancer and expresses her condolences to the disease's patients. However, Wendy is also shown to be rather narcissistic, especially when confronted with a female who she perceives to be higher than her in the social hierarchy. Examples of this can be found in the episode "Bebe's Boobs Destroy Society", in which the attention Bebe is receiving from boys prompts Wendy to get breast enhancement surgery, as well as in the episode "Tom's Rhinoplasty", in which Wendy pays to have an attractive new teacher killed.

Due to her liberal views, Wendy frequently comes into conflict with Eric Cartman. For instance, in the aforementioned "Breast Cancer Show Ever", Wendy engages in a violent fight with Cartman due to his mockery of the subject of breast cancer.

Wendy tends to be outcast by her girl friends for not giving into peer pressure: In "Stupid Spoiled Whore Video Playset", she refuses to participate in the trend of emulating notorious celebrity Paris Hilton, deeming her a bad influence towards the female youth, which leads to betrayal by her female peers.