I know nothing about you or your kid. But potty training that young has never worked for me and I've done 6+ at this point.

Toddler beds are always a winner, but that is because we used a real mattress. Kid mattresses are behind a huge amount of sleeplessness in my opinion. A real mattress with a real box spring that feels like a bed you would sleep in? That's what gets it done. Rubber sheets are great for getting through the slump between potty trained and not, but in the mean time, actually having a mattress a human would want to sleep on is a huge point of transition. Those bullshit, stuffed-shirt, faux mattresses only caused more harm than good. You can get a decent twin and not break the bank.

In terms of potty training, it is all on the child's schedule. Kids basically tell you when they are ready to be rid of diapers. Cloth diapers speed it along, inasmuch as they feel worse to have on when wet or soiled, ergo kids are more eager to get out of them. I still think three is the golden age at which the transition turns. Younger for some, older for others, and nighttime is always a crap shoot for boys especially. They will cue you when they are ready to be done. The MINUTE you get that cue, you start playing along. If she's not hinting or gesturing towards a diaper free life, you aren't going to get very far. Or, hey, maybe you will and I'm just not doing it right. I've just never pulled it off.

I'd say setting goals and deadlines for your upcoming pregnancy is just asking to be disappointed. Roll with what you have. Get a nice toddler bed that she can use for five to seven years. Real mattress. Real box springs. Then let her tell you when she's ready to potty train because it is really about her will, not your technique. But I'd be very surprised if you didn't have another year of diapers or some diapers at least in your wake.