Thanks for your reply.
I must say the wording in the Trust Deed is not great, but if all it says is that she is entitled to remain in the property and is responsible fo rthe outgoings, this would not give you any legal power to demand that the property be sold in order to
realise your interest under the Trust Deed.
If the Trust Deed had read "she is entitled to remain living in the property, subject to paying all outgoings" then this would give you more of a right to demand a Sale.
As with all cases of this nature, if it went to Court, the Court always looks at what the intentions of the parties were at the date the Trust Deed was signed. Although it is clear that your Mother should be responsible for the outgoings (as she is living there!), her non payment of these outgoings would not normally be sufficient for a Court to order a Sale, under the terms of any Trust Deed.
With Right to Buy Trust Deeds, it is normally seen that the beneficiary (you) is entitled to the proceeds of Sale as and when the property is sold, but as it is your Mother's residence, the Courts are not normally keen to order a Sale even if the Trust Deed had been worded to say she was entitled to remain in the property subject to paying the outgoings.
I hope this assists and you may wish to follow this up with a chat with a local Solicitor, but if you wished to pursue matters, we Solicitors would normally obtain a Barrister's opinion before proceeding with any Court action.