What is the meaning of "One giving way for another" in this text?

The author is expressing surprise that Deborah can successfully carry out all her different roles at the same time.

Deborah's "multi role" does not indicate how many roles she has, but does show that she has at least two different roles. "One giving way for another" could be expanded to "one role giving way for another role" and means "one role being neglected or abandoned in order to allow another role to be prioritized".