I do think that saying something honest but tactful like, “I’d love to see your baby pictures, but a video of the delivery is more graphic than I am comfortable viewing” shouldn’t be hrutful to her but let’s you off the hook. Nobody should be forced to see something they don’t want to; on the other hand, she is probably very excited about the baby and new parents tend to think the world should be just as enthralled as they are. A considerate reality check is not inappropriate!