That's good that you separated them. If they have each been in their own tanks less than 2 wks, they are probably going through relocation stress, but will certainly adjust to the new changes. Since they are 6 mo old, puberty will be starting shortly, if it hasn't already. They are both way to young to breed which would be dangerous at such young ages, so you did the right thing by separating them.
Your female not having a poop in one day really shouldn't be a concern. Make sure they are both taking the time to bask so they can digest the crickets though. It does sound like your male may be getting ready to shed.