Cernd the druid was the exact same. Had a 9 in dex, 13 in strength, 13 in con. The difference in companion ability scores was kinda crazy in BG 1 and 2 also. There was a 28 point difference between the characters with the most and least stats. Think if it as they rolled for the companions stats instead of point buying. More random so your party isn't perfect, it's random, flawed people that you have to use to the best of your ability. There will also be the option to make your own custom party of awesomeness, either a full party or 3 man in case they don't let us leave custom companions in camp so that you can still do all the companion quests.
It's not random though. The character is a trickster cleric, a subclass that relies heavily on subterfuge to fulfill her motives. She would have gone through some sort of training to become good at it. You don't just get to decide you level up from commoner lv0 to fighter lv1 and suddenly you are proficient in heavy armor and martial weapons. You had to go through training, which naturally increased your STR/DEX/CON and explains why you would be better at those things than other classes generally. The same thing applies to someone that worships trickery dieties. They would naturally pick up some ability to perform subterfuge and deceit, as it's the generally the main goal of the subclass. She doesn't have to be a master of stealth as she has magic, but she shouldn't have a negative modifier. I doubt Leira would grant powers to someone that couldn't sneak past a blind man.
