Maybe the writer used the wrong term (quadriplegic). The correct term might be “quadruple amputee.” She’s definitely not faking it.
You nailed it. The woman was his fianceé, Whitney Mitchell, and was a quadruple amputee due to septic shock. Garrett’s mother, Sheila also said that Foster and Mitchell had been together since they were 17 years old.
https://www.dailymail.co.uk/news/article-8561833/PICTURED-Protester-shot-dead-Austin-protest.html
One 19-year-old teen from Richardson has kept up her hope after getting an infection that left her a quadruple amputee. The unimaginable happened to Whitney Mitchell. An infection led to the amputation of all her limbs.
https://www.dallasnews.com/news/2012/04/28/quadruple-amputee-files-lawsuit-against-doctors-medical-city/