Have her try moving the Remora to the inside of her sports bra under her arm, non dominate side for a cross draw. If she's running she should be wearing a good high impact sports bra and they are always snug enough to keep the gun from bouncing. Plus it puts the gun in a great position for draw if your in a tucked position for protection.
They also make shirts and tanks for this but I've found the Remora and high impact sports bra works best for me. Just did a Marathon relay like that with no problems. All belly bands road up, twisted out of position, or chafed. Good luck and let us know how things go.
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