How about I take this as a sign from my friend?
Were you there when your friend passed away?
Yes I was at her place when she died
If you feel that it was a sign, it's okay to take it that way. Sometimes we see things that seem like signs and use them to improve ourselves or do something meaningful.
I'm planning to hold a party and dress like her.
It's good to remember your friend and believe that they are still looking out for you. I bet that the party will be a fun time.