Healing Prayer for a Loved One 

I often pray this when a family member or loved one is sick - be it a minor illness or a serious one, this Healing Prayer for a Loved One has always worked miracles for me.
For serious illnesses, I suggest praying this novena for 9 consecutive days and ask for a sign that your prayer has been answered. In my personal experience, I've asked for a white rose and it was manifested when I came to light a candle to her statue on the 9th day of my novena. She was holding a white rose between her hands and that's when I knew that my prayer has been answered. However, she could send the sign through other means such as when you see a white rose as you're watching TV or scrolling through your phone, etc. Talk to her and tell her what you need.
May you also experience Our Lady Mary Mediatrix's miracle in your loved one's life. Amen.