NO LONGER GIVING BREASTMILK :(

Baby girl is 8 months old. I have always expressed and gave breastmilk with her being a premie after 3 weeks of breastfeeding she preferred the bottle.

Over the last 3-4 weeks I gave her a mixture of formula and expressed milk. It’s been 3 days where she is fussing with breastmilk and prefer formula.

When does the mum guilt go? I feel so bad I have lots of frozen milk I’m going to use in her breakfast but I feel like the one thing I could do for her which was provide her milk she no longer wants. The guilt of not carrying to term and now not being able to provide milk :’(