Look, she’s most likely not calling him for “innocent” reasons, such as bcuz she has questions about house stuff. Let me explain WHY.
People do things based on the risk versus reward. If the reward is greater than the risk, they tend to do it. For example, if she TRULY just wants information and not your fiancé’s affection, then she wouldn’t risk upsetting you, her good friend, and losing a friend, JUST to gain information on home stuff which anybody can easily google.
The only reason she’d keep hitting him up is if there was some greater reward for her. And that greater reward for her is that she’s trying to secretly have sex with your fiancé.
You should casually ask how her conversations with your fiancé have been going. See how she reacts.
If she gets defensive, angry, or scared... you have a problem because she’s trying to bang him.
Even if she react calmly/innocently, you should tell her that you think it’s best if she checks Google and stops contacting your husband anymore
To elaborate… The risk of secretly contacting your fiancé would be great, (Losing you as a friend, possible social outcasting if people in y’alls social group judge her). This is a big and painful risk.
So she wouldn’t be doing that (secretly contacting your fiancé) unless she was hoping to gain something huge. This usually is a long term relationship with your fiancé. Or she could have a sick and strong urge to “homewreck” and sleep with married men. Yes, some women have this disorder where they strongly crave sleeping with their friend’s boyfriends, fiance’s or husbands.
Another similar example is, someone might go onto a roller coaster, because the thrill is fun and the chance of the roller coaster malfunctioning and causing harm to the rider is extremely small. They’re very safe.
However, VERY FEW people do hang gliding, because it’s extremely risky and has a high likelihood of killing you.