The 26-year-old midfielder helped the Gunners to the title last season, making 17 league and cup appearances.

Walti has featured 32 times in all competitions since joining the London club from Bundesliga side Turbine Potsdam in July 2018.

"She's made such a positive impact at this club," boss Joe Montemurro told the club website.

"It was very important to us that she signed a new contract."