New baby, new toddler sleep issues

[NewMumSept2014]

Hi,
Just looking for advice. I have DD who is 2.5 and DS who is 5 weeks.
DD has always been a great sleeper and until recently has slept in sleeping bag in her cot from 7.30 or 8 to 6.30ish.
When I was in labour her granny had to put her to bed and ended up having to lie on the floor next to the cot until she went over to sleep. She seemed to forget about this for a couple of weeks after I got home but for the last 2 weeks she has cried at bedtime until we do the same.
This in itself hadn't been much of an issue as she usually goes over quickly, but the last 2 nights she has woken at midnight/2am wanting us to do the same.
We did controlled crying with her when she was (much) younger which worked great and tried this again last night. She screamed every time we went out if the room and didn't settle for 2.5 hours (with us going in every 2 mins).
We decided tonight to transition to toddler bed as DH is off worn for a month so we'd prefer just to get it done now (while she's not sleeping anyway). Plus she was expressing this morning that she was a big girl and didn't want to sleep in the sleeping bag "like a baby".
I guess my question is, do we do what she wants and lie in there with her when she gets upset, or try to persist with making her fall asleep alone?
Things are generally up in the air with new baby and she has been Understandably out of sorts for the last few weeks. Has anyone got experience of similar things that just cleared up when older sibling got used to new baby being around?

[Handsoffmysweets]

Don't panic OP, it will sort itself out promise! There is 16mths between two of mine and for 4 weeks the toddler went from worlds best sleeper to absolute bloody nightmare. I honestly thought, what the hell had I done having another baby. It's not the best advice but it really does pass and if you can just go with it then it's so much better than trying to fight it. Maybe get DD a toddler bed and make a big fuss of it being her being her 'big girl bed' and how babies don't have one and it's very special and important. Keep up the praise and reassurance throughout the day as she'll know doubt feel a bit insecure and pushed out (not by you of course, it's just natural when they're so little). Personally, as I believe from experience that this is a very short phase, I'd lie in there with her as she needs the comfort and reassurance at the moment and any controlled crying may unsettle her. Honestly, this is all totally normal when a new baby comes along. I was chatting with a friend the other day whose previously potty trained DD has taken to having her morning poo on the living room carpet since new baby arrived 😂 Just keep up that old mantra 'this too shall pass' and I promise you it will. Good luck and congratulations on the new LO x

[Handsoffmysweets]

And hopefully my inability to spell correctly at 2:30am will also pass 🙈

[NewMumSept2014]

😊 thanks so much for replying so quickly! I love that you can post random worries on here at 1am and someone always replies almost instantly!
Good to know we're not the only ones and that it wil settle. Like everything else I'm just worried about bad habits but as you say it's early days so we'll roll with it for now. Have ordered star chart on next day delivery from amazon so hopefully that helps too!