Grief, second guessing, guilt, when does it get better?

I have posted here before and received some responses that were really helpful. It's hard to put into words the grief process I have been experiencing but it's been awful. I was put in a sudden position of having to figure out my MIL's (almost 80) entire life, bring her near us after she had been suffering from end stage liver disease, type 2 diabetes, some minor CHF and stage 3 kidney disease for many years. When she arrived she was so exhausted and barely eating, just a shell of herself and in total denial regarding the state of her health. She wanted to live independently and did not have the money for assisted living. I was willing to take her in but husband said no and the stairs would not work for her. I can't explain it but when we got her she had just gotten out of the hospital where she had almost gone into a coma and died and she just never seemed to bounce back. She had constant diarrhea but the only way for her to really have a somewhat clear mind was to take these medicines that gave her even worse diarrhea and she hated them. Long story short she was a mess but I did my best. I arranged home health, she got PT and OT at home, took her to the liver doctor who seemed to just want to push her along with recommendations to eat more and get a scope procedure...of course she ended up falling in the shower, so more PT and more OT, trying to make her senior apartment work with modifications- then it all hit and we were at the hospital with her 3 x in less than 2 weeks. Fluid drainage needed from her belly again (after many years of off and on fluid), incapacitating headaches, swollen feet and ankles, then a DVT that would require hospitalization for risky blood thinners so hospice was brought up and I needed to make a choice. I don't know why I didn't think it through more but I just went with hospice because she seemed so declined and it seemed great to get more help for her at home with all the issues she was having. She was never able to get additional liver procedures or a transplant due to her heart. She actually seemed to do better on hospice-showers, got to visit with all of my kids, tons of visitors, we were able to bridge care for her in her senior apartment without need for assisted living or a nursing home. She could still get around with her walker and did not seem confused or disoriented so we did not make her take the meds (what was I thinking!?) that were upsetting her GI system and she could eat a little more and have better quality of life-I feel it was a practical decision. This is what I regret. I feel like if I had made her take those meds she might still be here. Was it too soon to opt for quality of life over quantity? She was still pretty miserable-falling,leg cramps, fluid- all the things. Although we don't know for sure what caused her final decline in my mind it was all about those meds! I replay things over and over and even have dreams of going back and changing decisions and changing the outcome and making her take the meds. She did have a pretty sudden decline after over 2 decent months on hospice- it could have really been a number of different things- that is what is kind of weird about hospice when someone has so many things wrong. She just got weaker over a weekend, became bed bound and sleeping more-never agitated or confused and still interacted a little-we were told to give her some low dose meds at that point and within days she peacefully drifted away then turned bright yellow. Everyone talks about what a peaceful death she had and are moving on but here I am still replaying all the decisions and feeling so responsible and NOT at peace. 6 months behind everyone in my grief process. It is getting better because I realize things were just going to get worse for her than it already was but this has been torment for me. I loved her and miss her terribly but can't stop replaying all the details. I have done grief counseling and therapy and have my faith -does this get better?