Why in tarnation does your wife want to cross petition ?
This is exactly the sort of silly nonsense that used to happen when conduct could have a significant bearing on the outcome of the divorce settlement - both parties petitioning for divorce, which is total nonsense when you think about it - you both want out, so why not do it in the
cheapest and quickest way possible ?
It is highly unlikely that conduct will have the slightest effect on the financial settlement these days.
Does your wife realise the costs implications of this ? You don't want to waste your cash on fruitless legal disputes which benefit only lawyers.