I think your appraisal sounds right. Dogs, like people, go through a certain amount of trauma when their living situations change. She's got a new home, a new mom, a new family. Maybe she just needs a little time to realize that you're not going anywhere.
I googled the topic and came up with a Web site that might help. Good luck. She sounds like a sweetheart.
http://www.metrokc.gov/lars/animal/E.../dog/dog23.htm
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Mike ~ Doting Dad to Jillie, Harper, Molly, Cooper, Eddie (RIP), Lucy (RIP), Rusty (RIP) and Jack (RIP).
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