Is my friend being unfair?

So here's the deal. I semi-recently started seeing someone. It's going well and I'm very happy. On the flip side, one of my close friends is going through a rough patch when it comes to dating. She's not having much luck and has been talking to / going on dates with some true weirdos. In my opinion, she sets herself up for failure by prolonging the talking phase, and creates a false sense of intimacy that just isn't there when they meet. That's neither here nor there.

I have noticed, however, that as my free time becomes more limited in being able to hang out with her, her responses to me have become a little more cool. She's shorter with me, and makes me feel bad that I can't spend every day of the weekend with her. I feel like priorities naturally shift as we develop new relationships, and I am trying to be very proactive in scheduling days we can hang out, planning outings, hosting parties, etc., and when we do go out, she just complains about how she can't find anyone or gets really drunk and messy with guys she's texting as if it's almost a competition between us in who is talking to a guy. I try to offer advice as gently as possible when it comes to dating (while also admitting I'm no expert) and she just shuts down and says things like "Don't worry about it. I shouldn't have even brought it up."

It makes me sad because to a degree, I get it. I have been the only single friend in a friend group for a long time, and understand how it's difficult when your go-to Girly becomes a little more pre-occupied. But at the same time, I'm very excited about this relationship and wish I could share more of it with her. But at this point I'm afraid to say anything even remotely related to dating in fear of upsetting her.

How do I go about addressing this before it bubbles up too much?