Nathalie Björn started the match for Everton but was substituted at the break, while Hanna Bennison was substituted with 20 minutes left to play.
Anna Anvegård was missing due to the concussion she recently suffered.
This was the second time United played a match in the Women's Super League at Old Trafford, but last season's match was played in front of empty stands due to the corona pandemic.
United are third in the table, while Everton are ninth.