it may have been something else, but she didn't want to talk about it. things come up in people's lives that can stress them out enough that they can't even imagine working on a talk.
since this is the 5th sub talk you've given, it may seem like a trend. but, you don't know everyone's circumstances.
think about it this way: it's a great privilege to be used in this way! you're really helping out your sisters by being willing to take on the extra tasks.
if it is becoming a burden on you, though, then you should talk to the school overseer. just because you're assigned as a householder on a talk doesn't mean you should have to fill in for the other person if they can't do it. you have your normal assignments to worry about!
True, and I am glad I can serve Jehovah so much from the stage. I guess I just feel like a lot of my congregation has been shirking their responsibilities lately because they know they have Donovan and I to fall back on - Don gets just as many substitute parts. And I think it's unfair that just because we're one of the few single couples, people always look to us. Like our lives can't possibly be that busy because we don't have kids. People have actually said that to me. Like, "Oh, you must have plenty of time to do your studying, you don't have kids!"
(But as far as this instance goes, the sister said to me she didn't want to give the talk because she was just getting back from vacay. I guess it's possible she wasn't telling the whole truth, but I didn't ask; she just offered the info.)
I know what you mean. Sometimes I feel the same way being single. It's especially bad when friends say things to the effect of "You're single so you should be picking up the married brothers' slack, so that they can take care of their wives." (And if you think I'm exaggerating, a good (married) friend of mine said almost exactly that to me. I so wanted to deck him when he said that.) All you can do is look at it as an opportunity to do more in JEhovah's service. And, if it is overwhelming you, just let the brothers know that you need a break.