It sounds like you might need to revamp your classroom management strategies because they are not effective for this little one and you’re likely losing the rest of the group as a result.
Every child is different, but here are a few things that have worked for me.
If you have kids sitting at table groups, create a points system attached to some reward and use the power of peer pressure. For example, my table groups got points for having all their materials ready, having an organized table, quietest table, quickest to be ready for recess, etc... whatever I needed them to be more efficient at. I had an incredibly disorganized student who created a mess all the time, but his table mates became a huge help to him and modeled how to stay organized. I would then give that group a point for being helpful to a classmate.
I also used a color card system as a visual warning about behaviors. Everyone started on green, if I had to give a warning and a behavior continued I would flip to yellow. If the child turned it around, then after an hour of appropriate behavior I would flip it back to green(not too soon though, they really had to work for it). If they didn’t stop, then the red card was a loss of recess. Following that I had a blue card which meant a phone call home. Some people might feel this is punitive and not to PBIS standards, but after the first 2 weeks of school and consistent follow through on my part, I almost never had to flip beyond the yellow warning.
Using planned ignoring as a technique could work or backfire depending on this girl. In your case, it sounds like you ignoring it won’t help because she is being reinforced by her peers attention.
How about giving her jobs around your classroom that would keep her busy and might even be helpful to you? Handing out papers, floor sweeper, office messenger, coat area tidier, etc....
If she’s looking for attention then you need to find ways to give her positive attention. Catch her being good, connect her with peers or let her earn time with you, especially if her home life is bad. Build a strong relationship with her so she cares enough to behave for you. Maybe a special lunch for the two of you. Find out what motivates her and set up a checklist/points system so she can see that she can control her environment/world in a positive and productive way to get what she needs.
Good luck! Attention seeking is a tough one. Be consistent and good things will happen
