A jury at the High Court in Glasgow found 33-year-old Tracy Meikle, from Cranhill, Glasgow, guilty of the murder of Lorraine Foy, 36, in Glasgow, on June 22.
The attack was witnessed by Mrs Foy's two daughters.
In evidence, Meikle admitted she stabbed Mrs Foy to death, but denied murdering her and claimed she was acting in self-defence.
She said she took the knife with her because she feared she was going to be slashed.
She told defence QC Gordon Jackson that she could not remember what happened after that.
Judge Lord Jones deferred sentence on Meikle until next month at the High Court in Edinburgh.