I think ignoring her birthday will send a strong message that the new and improved manta is moving on! So please do not give into the temptation to contact her. Trust me on this one, I have past experience on this one (not with my W but with an exgf).
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018