My heart's broken for a friend

Some years ago, when my mom was still alive, she gave piano lessons to a lady named Emma. Mom and Emma became fast friends and always ended up talking instead of studying piano. When me and mom were struggling financially, Emma lent us money. If we broke down on the side of the road, Emma would send someone to get us if she couldn't come herself. If we needed a ride to a doctors appointment, Emma would take us. As my mom began to get sicker and knew she wouldn't be around much longer, she asked Emma to look after me when she was gone because she knew I would struggle when I lost her.
My mom passed away in 2006. I got the call from the hospital at about 4 A.M. in the morning. I was shocked and devastated. Mom had been fine when I'd left a few hours before. I knew I couldn't drive. I was too upset. So, I called Emma. She got out of bed, and drove 45 minutes to come pick me up and take me to the hospital. I was afraid to go into the room alone. Emma went in with me. She held my hand and prayed with me.
It was a couple of days before my sisters could get here because they all lived elswhere. Emma let me stay with her until my family arrived. I had noone but Emma stepped up and was there for me.
Emma's husband developed fluid on his lungs. The doctors did a procedure to releive it and he was sent home from the hospital. When Frank went back to the hospital I called Emma only to find that her husband, Johnny, had taken a turn for the worst and was at the University Hospital in Alabama. When I came home today from running around town I was going to call Emma but checked my e-mail first. I had an e-mail from Emma telling me that Johnny had passed away lastnight. Now, I feel helpless. I called her and am certainly going to the visitation and funeral. I'll send flowers and a card. But, what can I do for my friend? I will NEVER forget what she did for me. I feel like I'm just not good enough to do anything for her. I sat and cried, not for me, but for Emma. What can I do? My heart is broken for my friend who did so much for me.