A-Ha ... now we are getting somewhere. So she doesn't behave that way when her partner is around?? ... Interesting
Was the reason for the break up between her and ex (your DH) because of her flirtatious actions towards other men?
If she acts friendly and is then disrespectful, why on earth is this woman still allowed in your house? ... your DH must get pissed off with her too, not just you, if that's her attitude towards both of you.
I wouldn't be letting this woman in the house (anyway) and certainly not if that's how she conducts herself . I'm not saying don't let her in (because as you say, you have welcomed her in and it would now look strange to bar her access now), but just get her to stay for less time ... it only takes a minute or so to collect a DC (if the DC is fully prepared before she comes)
Have you tried wearing a low-cut top (and flouncing about) when she visits your house? ... LOL
only joking ... you shouldn't have to lower yourself to that ... but it could be worth a try LOL
I would restrict the amount of time she is allowed in the house, and if she starts 'acting up' or being disrespectful, get her out ... otherwise ignore her actions, it seems your DH isn't 'turned on' by it and he sees her as an irritation too
Ignore her.
Just sit there smugly (in your low-cut top ... LOL), drinking your glass of wine
, and laugh heartily at her