Hi,I'll try to brief.
I am having difficulties dealing with dd's adoration of her dad and the ow whilst being completely hideous to me and dh 
DD is 10 and was 8 months old when her df left me and the other 3 dc for another woman.
It was tough but I took it on the chin,never slated him or the ow and remained on good terms (eventually) with dh. We had been together for 18 yrs and id gone through breats cancer so believe me when i say I was heartbroken but kept that to myself.
exh has nothing to do with the ds's apart form to say Hi if he sees them and I have had to work really hard to get him to have regular contact with dd.
He has never paid me a penny as he is always out of work (on the fiddle) has had numerous luxury holidays but for years would say he couldnt afford a present for her birthdays or xmas.
He now sees her once a week after I threatened to stop access last year after no contact for weeks.
I mostly instigate this with calls and transport or dh does and she gets to go to his house with his 2 new dd's who she loves and just have dinner. This totals around 5 hrs a week,no calls or anything in between.
His gf (the prev ow) seems nice to dd but also is very young herself and not that understanding of a ten yr old. eg, asked if she had seen the Inbetweeners 
I remarried when DD was 5 and he is a rleally lovely Man. He didnt push things but alowed their relationship to develop over time and now they get on fairly well.
I dont speak to the ow,i have no reason to as i dont see her but isent flowers with dd when both babies were born and dd chats to me about her which is fine.
However she recently has been saying stuff like "shes pretty isnt she?" I just say yes. She sked if I liked her and I was vague,she pushed it and I said I have no reason to be friends with as we dont have a lot in common.
Today she was gong to see her Dad after I had phoned to arrange it and dh was driving her there.
I asked her to brush her hair and she got stroppy,I said her hair was a state and she was cheeky to me.
Leaving in a strop she then said to Dh all the way there, "Im going to see my lovely real Daddy who is the best Dad in the world",dh pretty much ignored this,she then was trying to get dh to agree that the ow was more beautifull than Mummy,dh didnt answer so she said "ow is my best friend"
Im really not sure what to do if anything. Its tempting to put her straight which we obviously would do but when I think how hard it was bringing them all up alone working a really tough job. They never went without,we had nice holidays the ds's all went through college,driving lessons etc and now dh is a fantastic step dad to her. we do lots of fun stuff as a family and give her lots of love and support.
She goes to a nice school and does lots of hobbies and has a nice life.
Any suggestions?