Some heart issues

As far as I know, I have never heared any women, to my knowledge, dying of heart attack. I thought it was a guy thing.
Until one day, two years, back.
When my mother turned 65, 2 years back, my husband told me to tell both mothers, his mother and my mother, to go and get a full medical check up. They both are retired and looking healthy and not too heavy. My mil agreed right away but told me she does not think my mother would agree. She is right. After retiring from a very stressful and responsible job, she is living a peaceful life. Nobody would ever think that she is scared to death at the mention of hospitals. Only those who are close to her knows that. But I decided to try my luck,anyway. As soon as she heared that, she said NO, and kept on saying No to whatever I was sayning..in the end I said, listen, you listen to me and go get a check up or I will not call you ever again and will not come and see you when I come home. She was silent for sometime. She knows I can be stubborn too. When she spoke next, she sounded a bit softer. She said, but I don’t want anybody poking me with a needle, or put those wires on me etc.she almost sounded ready to cry. I didn’t fall for that. I told her I will call her the next day and will tell what to do. Then I called my mil again. Asking her how they are going to do it and where. She said, since its not a life and death situation, they would go and see a friend who is working in the medical college, and see the doctors there. I said, okay. Since there was no need to hurry.
They had fun the first day, seeing the doctors and doing some tests and went to have lunch at their favorite hotel. And the next day was scheduled for tests to detect heart problems. That day when I came home after dropping kid at school, my husband told me, we have some news. I somehow felt ,it would be about my mother. And yes, it was. They found that,
my mother already had a silent attack ,and has leak on her valve. She used to complain about some minor pains and aches, but along with her, everyone was saying - oh the old age is getting a hold on her. And she said the soreness she felt was because she sometimes take bath a bit late in the evenings. Nobody ever thought it could have been signs of a more severe issue.
She was totally down and found it so hard to cope up with that. She couldn't’t think about living the rest of her life taking medicines everyday. Then it was talks and talks and talks from both of us and in the end, she seemed okay.Mil took her with her for the next couple of days and gave her all the support and strength she needed at that time.
Thankfully we got her in earlier so that she didn’t need any surgery. Doctor told her to walk 30 minutes everyday. Now he increased that to 45 minutes, which definitely boosted her confidence.
I was thinking, we have heared,and read many times about how so and so suddenly died. People would say, she was so healthy, had no problems. But one fine day she didn’t get up from bed and found to be dead. I used to think how could that happen? Every time i think about it, a chill goes through me , if it wasn’t for my husband, who out of the blue insisted on both of them going for a checkup,i don't know what would have happened. I am grateful to him ,and thank God for that.