Winnie,
So what can we do to give her access to the group again?
Probably what Duane said.
To find out, if she's receiving group messages by email have her look at the bottom of one of the messages, down in the footer next to the Unsubscribe link it will show her email address - the one that is subscribed to the group.
Have her also, while logged in, click on the drop-menu that shows her name, in the upper right corner of any Groups.io page. When clicked (or hovered over) that shows her email address - the one she is logged in with.
If those two are not the same, that's the problem: the address she's logged in with is not the address that is subscribed to your group.
She can fix this a couple of ways.
The first thing is to log out and log back in using the subscribed address. If she wishes to continue receiving group messages using this email address then that's all she needs to do.
If she'd rather receive group email messages at the other address she can go to her Account page (from that menu under her name) and change her email address there. This will merge all her subscriptions under this account into the account under the other address.
Shal
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