I'd keep doing the flowers bit, and maybe some gifts to work. Perhaps 3 times a month if you can afford. Its interesting that the peer group will see your effort and sincerity. I believe over time it can be a "fog clearer", because her peer group will obviously see the guesture and she will have to do her mental magic to make herself think its irrevelent or a manipulation. Over time the reality should start to winning out.
I strongly disagree and "wearing her down" is some men's idea of "winning out". That is why some can't get it through their head's to stop R talks.......or buying gifts. She doesn't like it! She doesn't like the attention it brings at the office and there are always questions from other women and believe you me, she will take it out on her H.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!