I am an ex smoker. I am not speaking out of turn. Cravings last 20 minutes, fact. Tough it out. Your child deserves it.
She KNOWS her child deserves it. That's why she is trying to quit. She's clearly seeking advice and help. Maybe since you have quit yourself, you could offer some helpful advice instead of painfully obvious statements that are only jabs and judgement passing.
OP-here are some things that might help (with links to peer-reviewed medical information provided. I am that kind of person. Validated research helps me decide what to believe and what actions to take).
Cravings are a symptom of withdrawal. Each person will experience withdrawal symptoms differently. It will be impacted by how much you have smoked and for how long, but there are other factors too.
https://www.nlm.nih.gov/medlineplus/ency/article/000953.htm
The psychosocial element of smoking is more to blame for cravings than the physically addictive properties of nicotine (this is why you'll usually crave cigarettes during activities when you used to smoke. Drinks with friends, driving in the car, coffee on the patio or breaks during work for me!)
https://www.sciencedaily.com/releases/2010/07/100713144920.htm
^this was published in a journal, but linking to it was hard and required a subscription to a service. This article sums up the study.
Only about 1 in 20 people are able to successfully quit smoking by going cold turkey. People have much greater chances of success with a step-down method. There is also NO noticeably reduction in risk (pregnant or otherwise) to your health when stepping down or going cold turkey.
https://www.ncbi.nlm.nih.gov/pubmed/23152252
In my OPINION (this is not a fact, simply my interpretation of the evidence/research), the best way to quit would be to rapidly step down (vs. going cold-turkey). This method seems to have a high number of people that are able to quit initially as well as sustain a smoke-free lifestyle.
This website explains the symptoms/triggers and offers some advice. It seemed very helpful!
https://www.cancer.gov/cancertopics/factsheet/Tobacco/symptoms-triggers-quitting
GOOD FOR YOU! Good job doing the best you can for your baby. You're doing a great job already. Best of luck quitting soon