Take the girl, RUN DO NOT WALK to the nearest mental health provider!
Sounds like molestation to me ladies, Better look at those WONDERFUL MEN. Do bother to ask how I know. Just take my word for it. The child is not wanting affection, she is seeking to protect others!
What you've described sounds normal and healthy compared to what others in this thread have described.
Girls missing their father who they don't see regularly is normal, of course, however, obsessive, extremely jealous behaviours and clear issues with boundaries is a big red flag. A child should be able to, and even desire to go off and play with other children and/or by themselves away from their parent(s). It's a normal part of development. A lot of the descriptions here don't sound like that.
To EVERYONE here (I'm surprised how common this issue is and how little is known about it - frightening!)
Google is your friend!
These issues with parent/child relationships that seem inappropriate or over-the-top, even if it appears the parent is (currently) exhibiting perfectly healthy behaviour towards the child, are likely the product of emotional incest.
Also known as covert incest, it's when a parent has leaned on a child in an emotional way, usually when a marriage or romantic relationship is failing and that parent feels at a loss and no longer has their partner to talk to, so they turn to a child they feel close with to confide in. Unfortunately for that child (and any future partners of that parent) this creates an unhealthy emotional disregulation between the child and parent where the child feels like they must fill an emotional role of a romantic partner. Whether the child or parent realizes what has happened or not, the bond is not healthy, and the behaviour the child exhibits will seem more like a partner, showing extreme jealousy, loose boundaries, and needing more attention or affection than seems normal.
Here is a very good article discussing it. It includes differentiating between covert, and overt incest (where there is actual sexual touching involved) and combinations of it.
https://www.psychologytoday.com/blog/love-and-sex-in-the-digital-age/201510/understanding-covert-incest-interview-kenneth-adams
It might seem harmless enough to have an honest and open relationship with a child that way, and in some cases it might actually be harmless, but in other cases it can prove to be too much emotionally for a child and cause these kinds of issues.
I strongly urge anyone experiencing this (or observing this) in any family dynamic to read the above article I linked to about "Covert Incest" on the PsychologyToday website and to seek professional help from a therapist, psychologist, or psychiatrist.
I know this is old, but I also have step daughters. They stay with us every weekend. The younger one (5) is more attached to me, since we've been together for 2 years and she doesn't remember me not being in the picture. Also, I work from home, and he works weekends so they end up spending more time with me. In the weekends I am practically her mommy, and daddy is second. The older one (10) loves us both but is more attached to her dad. She wants to always be around him, sit next to him or on his lap, etc. Honestly, they just love and really really miss their dads. When I think about it, i just feel for her. So I am probably one of those rare step moms who encourages it, because I believe she misses him all week at her moms and I feel sorry for her. Just try to understand it from their point of view, you get him every day, she just gets him every other week. She needs bonding time with him.
Yeah, sounds like you have different styles and ideas of how it should be. Ugh, it's hard figuring that out sometimes but saves us heartache in the end. good luck and peace