My girl starting IVF

Brex • Engaged to the love of my life.
I asked this question in another room but thought I would put it here because she's in this age group. I'm 25; she's 46. She's on birth control over the next few weeks. After that she starts injections of like three different drugs. She says there can be mood swings. Exactly how bad are these mood swings going to be and what can I do to make things better for her?