Similar here with ex-mil.
I was at local shopping mall and bumped into her not long after split, she tore into me about 'not letting him see dd when he's paying a fortune in maintenance and doing all the transport' he's not seen dd for 3 months his choice, wasn't paying maintenance so certainly no 'transport'! I showed her the texts on my phone where I kept asking him when he was going to see dd what was he playing at etc, his replies saying he was busy/working/ill (hungover from clubbing with ow), also texts saying he didn't see why he should pay maintenance as I was working at the time. I also made her come into my bank and got 3 months of bank statements printed off showing
A no maintenance
B me struggling with od and credit card just to buy food/cover bills!
That shut her up! I suspect she gave ex a right row as the following week he saw dd that weekend and took her to his mums and paid a SMALL amount of maintenance.
Over the years she has stayed in touch with dd but sadly no longer has the same influence over ex to be a better dad, I get the impression they barely talk.
I'd also like to say to anyone reading in the early stages of going through this inc op - don't believe what they tell you about how the 'new' relationship is working out. I found out through the grapevine that ex was not welcomed by ow's family and friends and vice versa, ow's own parents fell out with her for being so stupid as to
A fall for the 'my wife doesn't understand me' 'the marriage has really been over for ages' 'we're in separate rooms don't have sex' lines he fed her
B risk her career just as she was starting out (he was her boss)
C not making him wear condoms and ending up pregnant!
The biggest surprise for me was hearing ex-fil (who I thought didn't like me!) had called him a 'bloody idiot' for losing me! 
Things really aren't always as they seem.