No. 'You know' is "usted sabe." If you said, "Ella me sabe," you would be saying, "She knows me." But the kind of 'know' this is is the academic kind, not the empirical, experiential kind.
¿Sabe (ella)?
Sabe usted.....
usted ya sabe
Why doesn't mummy know
It means "You know Spanish, sister."
Que sabe usted/sabes? (formal/informal)
sabe usted/sabes ingles? (formal/informal)
scire tuum ius
It means, "...writes and knows Spanish..." It could also mean, "...[you] know and write Spanish."
sabe means to know, el sabe is he knows, this may be spanglish as in ; I told him so sabe.
"Yo sabe todo" is grammatically incorrect in Spanish. The correct phrasing would be "Yo sé todo," which translates to "I know everything."
I don't know = No se. ; You don't know = Usted no sabe. ; They don't know = Ellos (ellas if feminine) no saben.