Not pulling up on objects

My baby will be 6 months on the 10th and loves to walk if I’m holding her hands obviously she can’t walk alone yet and I don’t use a walker. She can stand holding on to the side of her crib but I have to stand her up there. Trying find ways to give them little legs strength. I’m concerned that she not pulling up on objects yet. Anyone baby pulling self up yet? She sits unsupported have since 4 months and can transfer toys from hand to hand, rolls both ways, and can pretty much lift self to sitting position from a half laying position but she will not attempt to pull up at all doc appointment not till a week after she turn 6 months