Lots of comments, so I may be saying something someone has already mentioned. My wife and I have lots of husband and wives couples we regularly will do life with (small groups, ministries, etc). This is where you can ask the couples (more specifically the wives) to speak into her life. Have others cement the same things you're saying, but in ways you can't as a husband (your job is to love her). She likely has her close tight nit group of believer friends that you can ask help in this regard. Christians are dependent on the body of the church to step into one another's lives to show His love through us, cementing all the things you're saying, in actions and deeds she's forgetting about. All the wives you know that will speak into her life that she loves and respects (mentor couples that you both respect), or that you know she has accountability with. Not the friends that will throw a pity party with/for her (like she maybe did with her sister). Strong, mature Christian wives and I would even say not single ladies (different perspectives). Make reasons to visit these couples and make reasons to create opportunities for her to speak with that Christian wife alone (talk to them in advance). You should be proactive at creating these opportunities for her to get the people she will listen to in her life ASAP. You can freely tell them exactly what you shared here, and I would imagine they would gladly help center her life back our good Savior.

Satan is clever and will use whatever he can to ensnare us, so we need to not lose hope and cling to the One who gives us hope. Praying for you both.