I am going to assume that your sister in law is not a braggart or showing any kind of attitude...

If so, congratulate her on her kill and give her her just due. If she picked the location and hung the stand the stand herself, she deserves an extra pat on the back. To hold it all together, and make a good shot on a buck of that caliber with a bow the first time out, is worthy of some praise.

Every year I put and take down many stands. It is not out of the ordinary for me to have more than twenty stands up on any given day during the season. 99.9% of those I carry in, hang, and trim lanes by myself. I will hunt every day I can. I had a two year period where I hunted some portion of the day, everyday of the season without tagging what I consider to be a big buck. During that time I only saw one good buck that I estimated to be around 145 ". He came close enough to shoot but he didn't offer me a shot so I had to watch him walk away. I have a friend that I introduced to bowhunting and at this point he had shot two deer in his bowhunting experience a small buck and a doe. On a windy wet November morning before shooting light I made out the figure of a human approaching my stand, it was my buddy. He was going to sit in the stand I occupied but didn't know I would be there. When he saw I was there he apologized profusely and I sent him to one of my other stands that the wind was right to hunt out of. Long story short, that morning he shot the very buck that I had seen out of that same stand a year earlier. It was a wide 150 class buck, a real beauty and I am "tickled pink" for my friend. Again I hunted everyday the rest of the year and never even saw a big buck let alone tagged one.

Many of us will spend all summer shooting, invest many hours scouting, shed hunting, take every precaution we know concerning scent contol, and spend hundreds of hours in a cold treestand. No matter what our woodsman skills are or what kind of abilities we have, we can't make a big buck walk under our stand. Further, if and when a big buck walks by your stand you have to be in it. Luck will always play some kind of role in a harvest. That is one of the reasons a guy should never judge a hunter by the size of their buck.

Pat your sister-in-law on the back and enjoy the moment with her.