Hello everyone! My daughter is sitting for a while, not long. Sometime…

Hello everyone! My daughter is sitting for a while, not long. Sometimes when she's standing by the support, she might sit down on her knees and snuggle up against her bottom or get into mermaid poses, not for long in such a pose. She keeps her spine straight but sometimes wobbles. That being said, how much longer should we wait before putting her in a booster seat or doing any other position like sitting in a stroller? Also, when she's in a booster seat in a semi-lying position for buckling up and sits... Thank you))))