Haven't read the thread, skipped to the end so apologies if I'm repeating someone else.
I'm afraid as it stands the ex has all the control. She shouldn't, but she does. Poor DP has been trying to get proper access for 2 1/2 years. His story:
Met a girl, seemed nice, started dating. She has serious problems with her mum, is kicked out lives with DP after only 2 months. Girl starts exhibiting volatile behaviour but DP knows her history is pretty damaged and thinks he can help her. Things get worse, he is accused of sleeping with anyone he talks to (including male friends), if he does go out he returns home to the washing machine eating his favourite top etc.
He finally resolves to leave years later when he can take no more but she announces she's pregnant. He stays. Things seem to get better but she returns to her previous behaviour and when DD is 8 months old he breaks up with her. After a fortnight she agrees they're better off apart, he sees DD as often as he likes including a whole weekend while she's at a hen weekend.
Fast forward and she finds out we've started dating and cuts all contact. DP goes to a solicitor, tries to get funding etc DP requests mediation, ex makes up a load of hysterical nonsense, cries on demand etc. talks break down.
6 months on and still no closer legally, she has a change of heart and allows him contact. It's phased to allow DD to be comfortable with DP again. Progressing nicely until ex makes it clear she wants them to get back together, he refuses, she cuts contact again. DP restarts legal proceedings.
More mediation. Ex says DD must return without any stains on her clothes, must not see any member of DPs family and other strange requests. When DP objects, mediator asks him if he actually wants to see DD. DP reluctantly agrees to long list of demands. Ex says she's changed her mind and he can't see her.
Another 6 months of legal stuff. Ex gets into contact and says DD is asking why she doesn't have a dad so restarts gradual contact and eventually months later allows DD to meet me and my DS. A few weeks after that she says DD wet the bed so it must be my fault and I'm not to see her again. Says DD said I pushed her over, that we only played with DS and ignored her, that she doesn't want to see me or DS again. DP starts seeing DD alone but meets his sister which angers ex and she stops contact!
Currently he is back with contact. It started with ex being present, but always out somewhere so DP had to buy tea for them or at the kids soft play which he'd pay for etc. ex and DP argue whenever they meet so she eventually agreed he could have an hour alone per week. He isn't allowed to meet with anyone else during this time. DD was naughty at nursery and ex decided this was DPs fault so his time was cut to 45 mins!
He's now going to bite his tongue til after Christmas and finally go through with legal proceedings.
Sorry for the long post, this isn't even the half of it! If she wants to be a knob about it she can drag it out forever is my point!