Welcome!
You love your wife, I get that, but that doesn't mean that you should or will accept anything she does. When you became married, you both vowed to love, honour, support and respect each other. She hasn't been living-up to her part of the vow. You need to stop accepting her bad behaviour.
If you hope to remain married, you need to have a calm, rational discussion with her on your expectations and what is and what is not appropriate behavior in your marriage. Her discussing everything with her parents or anyone else, is inappropriate and unacceptable.
You will need to do similar with her parents. Don't rely on your wife to set boundaries with her parents as she opened the gate to cause them to be as involved as they are. While you should expect she will support whatever boundaries are established, you need to be the one to set them.
With regard to her 'affair', the excuse of her fear of being a Mom is obviously BS. Did she first discuss those fears with you as her partner? If she wanted 'spiritual' counselling, why would she be contacting an elder in another cong?
If they were texting naked photos and sexual fantasies in advance of their private meeting, then she knew full well what was to happen in the hotel and it was all premeditated.
As she wouldn't be texting those types of things immediately on first meeting someone, I suspect the relationship had been going on for some time but finding out she was pregnant, caused her additional guilt which she wanted to unload.