I think we all made our first batch like that so good for you trying something. Now how you want to make them next time is like this;
buy a brownie mix that requires oil, I like the one with MM's for the top. Put required oil in a small fry pan and add weed 5/8g or hash 3/4g grind it up. Heat on low LOW heat for 15 to 20 min mixing often. If you smell the smelling it's to hot turn it down LOW is the key. 250 no more.
Put it through a gold coffee filter top up to what the box calls for let cool and make them up. Makes 18 for most people 9 if your brave.
Ingesting effects people way different than smoking, what happen to your wife is very common and it's too bad, I know it's happened to me a couple times when I experment. The trick is to go small at first you can always do more later. It takes 1hr to 1hr 45m for most people to start to feel it.
Next time someone get too much there are a few things you can do, go to sleep, drink lots of fruit drinks and eat sweets. It's not fun when your that FU trust me, you can see god if you do to much.
Keep going all the best and I hope one bad experience won't keep wife away, go slow.