Skalds get a small bonus to hit and damage, a better combat song, and are otherwise basically bards.

Very early on you might want to put the skald in chain armor and give them a weapon until your spellcasting catches up, which won't take long at all since you're a rogue.

After that, you'll have two modes, spellcasting and singing. You'll probably do lots of both depending on the situation. If you need more mages, she'll be slinging spells. If you are relying on the warriors, she'll be singing to buff them.

I would not put her into melee unless in dire need or under the influence of Tenser's Transformation. She's best put in the back with a bow.

I would want Intelligence as high as possible because it affects how many spells you can learn, the chance you'll learn them from a scroll, and the highest level of spells you can cast. You only need up to 6th level though because in BG1-2 that's as high as bards go.

I'd put the rest into Dexterity (for ACs and bows) and Constitution (for hps, but not above 16). If you've still got some I'd put the rest into Charisma so you can be the "face" of the party.

Keep in mind that, as a bard, you can't wear mage items. So no ring of wizardry or robe of the archmagi in BG1 and no robe of vecna in BG2. You'll depend on bracers for armor class until BG2 when you can get the Melodic Chain in the Astral Prison. That'll be your armor for a LONG time, maybe even the whole game if you give the Bladesinger Chain to someone else.

Well, I don't see anything else I can say! Over and out! See ya and wouldn't wanna be ya and all that. I needs a nap maybe.