Beth will be out for an extended period after damaging her knee.
She will see a doctor in the next few days.
The Golden Boot and Player of the Tournament awards were earned by the England player.
She was runner-up in the Ballon d'Or in the year 2022.
"Everyone at the club will now be supporting Beth and working hard to get her back on the pitch as soon as possible," Arsenal said in a Arsenal statement.
The team has played seven games and is second in the Women's Super League.
She has scored 29 goals for the Lionesses and won her 50th cap for England in a recent friendly game against Japan.
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