HeadCanon Inc: The reason Asari don't bond to have children until they're 300+ years old or so is their brains and nervous systems have yet to finish growing; bonding at a younger age isn't bad per say in that it doesn't cause them harm, but it does result in having a significantly stronger imprint of their lovers' mind. They don't lose their sense of self or start thinking of themselves as the other person, but they do pick up little physical and mental ticks. An Asari may find herself reaching up to brush back her bangs, or wanting to headbutt something, or feeling nervous when a ship is quite, or maybe even starting her sentences by stating the emotion she wants to convey.
Liara, being only 109, has imprinted some of Shepard. The Shepard arm-cross, Shepard's feeling of comfort while wearing a hoodie, and a little bit of Shepard's sense of humor have crossed over.
This takes place a decade or so after ME3. Shepard, Tali and Garrus are off doing orbital skydiving near Banff, and Liara is walking around rebuilt Vancouver. She just noticed a little human girl with her parents, and she overhears that the girl's name is Shepard. She's thinking that Jane would walk over and say hello, but she's happy to just watch from the shadows and be content with all that they've been able to accomplish together.