Divorce Support Forums: Witnesses during trial

So, my stbx will not agree with me on custody (I am the husband). She is now basically going through my records trying to find any dirt possible to demonstrate I am not a fit father. Since I filed in Jan (due to 6 long years of dealing with my wifes alcoholism), I have surrounded myself with support of friend and family. One friend lives in California - I live in Michigan. This friend is female and happily married for almost 20 years. I have been friends with her since college days - almost 25 years. She has been a tremendous sounding board for me and has helped me emotionally during this roller coaster of a process. Well, my stbx found my cell phone bill and saw the calls to the same number in CA. She is now convinced I am having an affair. My question is this - can she include my CA friend on her witness list and subpoena her to appear for deposition? I would feel terrible to put her in this spot of having to travel across the country and be accused of having an affair with me. Her husband knows that we talk, but I am concerned that it would create problems with her marriage as well.

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