It's not really overly guilt-ridden? Ume did a lot of truly horrible things over the previous few years they she's trying to unpack so as to not fall back into her old ways. But! Forgiveness is part of that rebuilding process. Forgiveness from those she's hurt is important -- and she's had a surplus of that -- but it doesn't work if she isn't the first to forgive her past self. The kindness she's receiving won't help with healing until she lets it.Wow, I guess that Sawako's overly kind nature unintentionally caused Ume to become overly guilt ridden.