Assuming that the eviction is illegal which on the face of what you have told me it certainly is, then she is entitled to substantial compensation for unlawful eviction.
She may be entitled to legal aid so it would be worthwhile ringing around a few local solicitors.
you can search by postcode and specialism on the Law Society website www.lawsociety.org.uk find a solicitor link which is at the top left hand corner of the page.
She also needs to go to the local authority because with dependent children under 18, the local authority will immediately provide accommodation.
If she paid a deposit and the landlady did not put the deposit into a statutory scheme she’s also entitled to compensation of up to 3 times the deposit plus the return of the deposit. If you Google
Tenant deposit claims solicitor
You will find lots of solicitors willing to take on this. Try to find one that will not just deal with the tenant deposit claim but will also deal with the unlawful eviction.
Thank you for letting me assist you with your legal question. I am glad that I was able to help.
I am not certain whether that answers the question for you or not, but I am happy to answer any specific points arising from this.
It will be my pleasure to help you again either further with this or any future questions you have