No problem , but make sure she is registered as a tenant as well as your selves. This means she will inherit the tenancy after your deaths and should you pass away unexpectedly she will still be able to live in the house without problems.
By the way there are differences between actual council tenants and those such as myself whose council has sold the housing to a housing association. As a council tenant or an ex council housing association tenant you also have the right to buy your council house at a discount , this right can also be passed on to your child / children if they are registered as tenants. It is worth up to £89,000 or £120,000 in London so a not inconsiderable amount!