Retraining and work flexibility isn't that easy with children in tow. Kateykrunch's DD is unlikely to receive much redundancy money. Depending on personal circumstances, she'll probably find she needs the money to tide her over until she finds a new job. She needs to check how the redundancy pay will affect JSA. Unfortunately, all schools are cutting support staff, so it could be difficult to find a new job.
The redundancy payment might be complicated by her support staff contract, because support staff aren't usually paid for a whole year and are sometimes on variable contracts. She should ask her union official for details about how it will be worked out.
Kateykrunch If your DD isn't already claiming child tax credits, I would advise her to apply now. These will carry on after redundancy and should increase.
After redundancy, she will receive JSA (approx £73pw), approx £60pw child tax credit for each child (plus existing child benefit - £33pw?). She should receive housing benefit Possible as part of Universal Credit), which depends on the Local Housing Allowance for her area and how many bedrooms she has and is eligible for a reduction in council tax (which depends on an individual council's policy). So, in total, she will receive about £193pw plus some housing support. The children will also be eligible for free school meals. (Sorry! I don't know the exact figures any more). She will also be required to attend the JobCentre every two weeks and spend 30 hours a week looking for jobs (and show proof she's doing it). If she wants to do a training course, she could take out a loan, but could find that she's no longer eligible for JSA while she's doing the course.
PS. Agency work as a school support worker should be avoided. The going rate is about £40 a day. Agencies aren't usually able to offer more than a couple of days a week (if that). The work is often at short notice and she will have to be able to find childcare. The money will be deducted from JSA, so she could end up working for nothing, but paying travel and childcare costs. If she's in an area with Universal Credit, it could also affect the amount paid for housing.