Nobody wanted to be goalkeeper, so my 12 year old said yes. She shuts her eyes when the ball comes

Her school has started a girls' football team this year and she joined with two friends. At the first practice the coach asked who would go in goal, nobody moved, and she put her hand up. Very proud of her for that ❤️ The trouble is she is scared of the ball. She told me she closes her eyes when someone shoots. The coach has twenty girls to manage and I don't think he has time for one nervous keeper. Is there anything we can do at home to help her get used to a ball coming at her? I'm not sporty at all, but my partner has offered to stand in the parking area with a ball on weekends.