Night sleep if different to day sleep, it's developmentally normal for LOs to learn to sleep, and transition, at night before they do in the day.
I would persevere with W2S, going in 10 mins before the usual WU time and shush/pat right through to deep sleep, 20 mins or even more. Do you have the time/energy to do this? Maybe for one nap per day (I suggest first nap, don't chop and change naps though). If you don't find success with doing that consistently then I would suggest doing several days where you stay in her room, in the dark for the rest of the nap time before bringing her out to E then try to do close to a full A following that before taking her for another nap. This means the A in reality ends up very long (all the time she should have been sleeping but wasn't plus the E and following A time) but if you persist with the routine her tiredness should help with getting things on track as she will be very tired and more able to fall to sleep at nap times and stay asleep with W2S at transition times. This way you teach her to have longer naps.
I wouldn't go up to 2hr or 2.5hr A times if the naps remain 30 mins. it would be different if you were saying that after a super long A time she would sleep a good 2hr nap but she isn't.
I would encourage use of the lovey (yes a bear or any item that is safe for her. After she falls to sleep you can remove it form the cot for safety reasons. My DS has a muslin square as a lovey, handy as they are so easily replaced if lost/dirty etc, and I used to remove his after he was asleep until he was older. SIDS guides say not to put anything in the cot until 6 months, so you need to judge for yourself what you are happy with and for how long etc). Hold the lovey between you when you cuddle and really at any time of the day so she learns to associate comfort from it. You can't force a lovey on her but you can encourage it and see if she takes to it. When attached it is a great source of comfort for a long time, through illness, teething and sleep etc.
hth