Help with spiritual feelings?

my older sister (Natasha) ped away 17 to 18 years ago , just when she was a few weeks old. i have never met her but recently i randomly thought of her at my last school lesson about 3 o'clock. when i got home my mum was a bit late. so when i asked her why , she said she had just been to see Natasha's grave but my mum very rarely did because it is far away so petrol is a struggle. Now my mum was at the grave at the time i was thinking about her. I'm just wondering if this is a coincidence or if its something more?