Ah see I missed that bit. So she was with him then, and stood by him?
Dopey git.
I'm sorry actually, I'm projecting a bit.
A close friend of mine went through the same sort of thing. No mutual kids between them, luckily, however she had been 'warned' when she got with him, but it was by his ex so of course he came the 'she's just stirring it'
My friend also minimised the incident/arrest. She said she would stand by him, innocent until proven guilty ect.
Over a year later she now feels angry and mugged off by him, obviously these people (sexual offenders) are intelligent and manipulative, often really nice people, as, let's face it, if they were horrible no one would allow them near their children.. I was tempted to say she sounds like she needs a handhold, or someone to talk to, not to be pushed out. But now I'd say approach with caution, obviously there are female abusers out there and a lot more than we'd like to think,
On the other hand, you're right to be concerned about the school allowing kids to change in full view of parents, I'd be
about that too, mind you, I have been known to hide DS in a corner to try on clothes which means a strip down to pants or vest lol sure he will forgive me when he's older 
It's as shitty IMO for the partner of an abuser or someone arrested for sexual offences, as it is for the victims family (not the victim themselves of course) it must be so lonely, and from what friend says, when her home got raided, frightening and shocking.
It's a huge pebble being thrown into a pond really, abuse. So many victims and victims by association.
Btw the woman will probably not want to confide in anyone in case they're milking the gossip 
What a shame for everyone concerned.