THE ANSWER:

Anna’s needed call was I-23,
Cora’s was O-72,
Erma’s was B-8,
Ida’s was N-31, and
Myra’s was G-54.

One possible logic sequence:

Per Clue #1, Ida’s call was N-31, since the letters under “N” run from 31 to 45.

Per Clue #2, Myra’s call was either I-23 or G-54.

Per Clue #3, Anna’s call had to be I-23, since 23 is the only prime number left. Myra’s call is G-54 since that’s the only option left for her.

None of the existing matches works with Clue #4, so one of the two unassigned combinations must be the match. It’s Cora with O-72, the only one that matches. This leaves B-8 for Erma.

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