[CAUTION: I am not a teacher:take the advice and or corrections offered in this post at your own risk.
If you doubt the information, please get a qualified opinion from one of the teachers on these forums.]
Is the phrase "to relieve her" really what you don't understand? Or is it why she might be relieved in the first place?
"To relieve her" could mean "to make her feel better, to make her less anxious, to take away her worry or anger". However, if you understand the extremely complex passage above, this should be simple for you.
The indication of why she needs relieving is not revealed in the passage you have included, we would have to first see why she is upset/worried/angry.