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Cut directly to the chase: "I recommend that you explore this further with [name]. Here is her contact information. She's very knowledgeable about this and will be an excellent resource for you now and in the future." Saves time and trouble.
I do this, more or less, if I have someone specific to recommend on a specific topic.
Thanks for reading! I actually think that based on the importance of your work, you are under-quoted. 
Regarding your question, you are on the right track. Persistence in recommending women colleagues is the key. If a reporter never takes your suggestions, mention it to them.
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