Are you pairing a collar grab with your recall? If not, that's a good thing to start doing. You want to desensitize her to collar grabs rather than shying away and playing the keep away game when you reach for her. You can also work on grabs separately at first whenever she's near you, marking it either verbally or with a clicker and then giving her a treat. The more of a foundation you can build up that collar grabs are good, the easier it will be to grab her collar for something she's not fond of, like pulling her away from something she's not supposed to have, or to give her meds or a bath or nail trim, etc.
I like to train a whiplash turn, where the head whips around immediately when you say her name. Toss a small treat a few feet away (I teach my dogs "find it", which means there's something yummy on the floor, or to go get a particular toy), and as soon as she gets to it, call her name. You mark the behavior the second her head starts to turn back towards you, and reward her with a higher value when she comes to you. Once she's playing the game consistently, toss the treat further and further away so she's running back to you a longer distance, like the length of a room rather than just a couple of feet. From there I like to toss a treat and then call my dog as I run away. If you want your recall word to mean come to me and sit in front, you need to turn around and cue a sit right before she gets to you. I wouldn't worry about that too much at first though, reinforcing the recall is the most important thing but feel free to add it and then mark and reward the sit in front as soon as you think you can.
I do short recalls on leash when I have my puppy out for walks. I quickly run backwards a few steps, calling her to me. I mark and reward the sit, then lure her back into heel position and we continue on. I try to do several of these each time we go out.
Restrained recalls are terrific. Keep in mind her age though, the distance should be very short for a young puppy. I do flyball, and that's one of the very first things we train. We want the dog to run to their handler with speed and enthusiasm, ideally for a tug reward. With a puppy I'd probably use food though, unless your girl prefers toy rewards. Whatever you use, it should be high value. My puppy is 8 months old and I took her to flyball practice last weekend to start restrained recalls. This was the first time she's been off leash at a public park, and you can see she ran right to me for her tug. We need this behavior to be very strong since a flyball tournament is an extremely distracting environment, with at least 15 people and 8 high drive off leash dogs in the ring, crating areas nearby with barking dogs, and sometimes spectators, so it's something we constantly work on in practice, even with seasoned dogs who have been racing for a long time.