The member of the hunt group must put the first call on hold and then hit the hookswitch for the 2nd call to be presented to her. It's the nature of hunt groups on the Inter-tel system. She will then be able to switch back and forth between them on the Call Keys.

If she is the only member of the hunt group and Wrap Up mode for holding ACD calls is enabled in System Flags, it may not present itself right away or at all. It depends on what the Wrap Up timer is set for. I just ran into this problem recently. If it is a UCD hunt group, that flag is inconsequential.