My girlfriend is about 5'1 and 130lbs and she is most comfortable around 36lbs when target shooting, however the lowest legal draw in Arkansas is 40lbs so we will have to kick it up 4 lbs for deer season, but this is not a problem since you won't be repeatedly shooting, you just need to be able to pull it once. If you struggle with 50, go with the lowest legal weight. The difference in speed between 50 and 45 lbs is going to be minimal. Speed is overrated in bows, just find the weight you are most comfortable with. Also practice sitting down, standing, kneeling, etc. You might be able to pull 50 in perfect standing conditions, but any bowhunter will tell you that the shot position is not always optimal, so keep that in mind.