I think your DD needs to be very real about this situation. 22w is VERY early. Many states in Australia will not provide assistance to babies born before 24w, many countries in Europe also have the same protocols. My youngest was born at 25w. Our state is an exception to the above and does provide assistance to these earlybirds however the outcomes are often not good. I know only one 22 weeker who survived past her first few weeks. Unfortunately many babies past whilst we were in NICU for 4m. Statistically if the baby is a white boy, they have the worst survival rates, African american baby girls have the best rates.
The best things your DD could do would be to -
1 Offer to be the contact person for their social circle. Set up a FB page to update people or set up a phone chain etc.
2 Be there as a shoulder, if the baby does make it it's going to be months of hard work.
3 Food is good.
4 Transport is great.
5 Keep in mind that if baby comes home they will most probably have MANY hospital follow up appointments and Mum might need support or transport for those.
6 Offer to run errands
7 Offer to clean the house or do gardening, walk animals etc
It's a really tough time and i will be keeping this little one in my thoughts.