Why did you ask for thoughts if you already sent it?

Honestly, I feel like you're seeing this solely from your perspective. Your friend is pregnant and I'm sorry if I sound a little blunt but that is much more of an upheaval, and more life-changing, than going on a date. She may be tired, sick, over emotional... this isn't the time to send passive aggressive texts accusing her of not caring.

It would be better to focus on what you want to change and keep it neutral and upbeat, eg I would have suggested saying: "Hey, I feel like we haven't had a good catch up for a while and I'd love to tell you what's going on with me." If you're accusing her of not caring then I kind of get why she didn't read your last email.

You say you are there for her. Are you though? Really? Or are you just wanting her to be interested in you? Sorry but nobody's dating life is that exciting, I don't think anyone wants to know everything like people do on TV. You want to tell her stories about dating but are you interested in what's going on with her or are you deciding what her life is like (eg you decided you're lonely and she's not) and not actually asking her?

I'm married. I feel lonely sometimes. I would be very upset and very angry if I got this email. It is drama. Sorry. Who are you unburdening and explaining yourself for? This email isn't for her. It's for you. It's not a white flag.

If I were you I would write her again and say you are sorry for being kind of caught up in yourself, you miss her, how is she. Sorry to be a bit blunt here.