No Naps (Again)

I know, I know I have written extensively on the sleep problems we have been having. I stopped writing about that for a while, partially because things got better, and partially because it is really boring to read! But while nights are good (knock wood) and I am extremely grateful, naps are not going so well. We had reverted back to stroller naps, because I was desperate for Anise to get enough sleep. But I don't find that to be a good solution, partially because with the winter we are having it is just too difficult, I need the break in the day to get stuff done, and I think it is time for Anise to have positive sleep associations with her own bed. I was given advice from someone I trust, who helped me get to the point of no more nonsense, Anise must now nap in her bed. Her technique was a "cry-it-out" but going in every 20 minutes. She promised 3 days. But since I had already been having unsuccessful cry-it-out sessions with Anise, going in every 20 minutes really didn't work. My limit for letting her cry for a nap is 1 hour and a half, and maybe that is my problem. She doesn't end up falling asleep by the end of that! She can just keep going. The more she cries in her crib, the more she will hate going in there. After the first couple of days we had made tins of progress, Anise went down for a nap with no tears, although she only stayed asleep for 40 min (which for a 16  month old who woke up at 5am, is not enough). I figured eventually length would come. I was wrong. The past couple of days there was a lot of crying and no sleeping. At this point I am totally freaking out, because she is not getting enough sleep, and I am worried that will impede her cognitive development. But now every time I out her in her stroller, I am reinforcing  the problem. She would take 2 naps and one would be almost 2 hours if I kept rolling, compared with one 40 minute nap at home...I am really stressing out and honestly do not know what to do. I have literally tried everything.