your optimism has always been great (I wish yoou could bottle it and send me some)
your W sending you that video was just plain mean. she may not have realised but it was mean and unsurprisingly it had a negative affect.
you might want to ask her not to send that stuff or you might even want to assertively tell her that it was a mean thing to do.
most likely though i'd say your best bet is to just try and ignore them when they are sent. dont open them dont look at them (control the bit you can control)
Both mid 30s, 2 young kids BD 7sep14 XW moved on long ago, now living with OM1 D paperwork in progress