I am not sure what your, or her, religious practices are. The Moon, even in a non-spiritual sense, has a great deal to do with fertility. Then there is Luna the Moon Goddess. She is/was a Phoenician Goddess still referred to by billions of people today(even though they don't know where or why they use the term.

It has a great deal to do with routine but the rituals involved with the worship of Luna are easy and may make things easier on your sister. If you think they might help go here and ask for help:

http://www.pagan-network.org/forums/index.php?board=18.0

You need to register in order to post.

Or otherwise if I offended you please accept my apologies.

“None are more hopelessly enslaved than those who falsely believe they are free.”-Johann Goethe