Out of energy

Please help. I have been married to my husband for 3.5 years, almost 7 years together. We have a 15 months old and due with our second in one week. My mother in law has never made an attempt to get to know me, form a relationship with me, or put forth any sort of “family” feeling. She lives a 3 hour plane ride away so we see her 1-2 times a year when she comes to visit. She’s the only family that my husband talks to so they aren’t family oriented at all. I on the other hand am VERY close with my parents. I see them almost every single day, speak to my mom multiple times a day on the phone, and have a very close relationship. His mom doesnt call me, doesn’t check on my when I’m pregnant/sick/going through something. She’s extremely uninvolved. My husband doesn’t see a problem with it because she’s not mean or over bearing so he just chalks it up to “she doesn’t want to feel like she’s bothering us or she doesn’t know how to be involved because we have no family”. It really drives me crazy because when she does come to visit or when we do talk it feels like a stranger, as she makes no attempt. I’m so close to just giving up, i dont know what to do. I know most people would say to consider myself lucky that she’s isn’t overbearing but it’s equally annoying when someone just doesn’t give a fuck. What do you mean you don’t know how? You don’t know how to pick up the goddamn phone and ask how someone is. She doesn’t call to see my son or text to ask how he’s doing. I’ve grown to have a lot of resentment towards her and now strongly dislike her. Please help. Am I the asshole?