What do you mean by "none of this tenant in common stuff"? When property is jointly owned you are either tenants in common (in which case you both own an identified share) or you are joint tenants (in which case you both own the entire property jointly). Neither is inferior to the other - the only real difference is what happens if one of you dies. If you are tenants in common your share passes according to your will. If you are joint tenants the survivor continues to own the entire property on their own. So there is nothing to be inherited.
Either way, your rights as a joint owner while you are still alive are exactly the same. Basically to sell the property both owners have to agree and sign the documents. Without your signature your mother cannot sell. Similarly, she cannot remove your name as an owner without your consent. And no solicitor would ever pay the money solely to your mother. They would either issue the money in joint names, or they would pay you each your relevant shares.
Having said that, if you cannot agree then either of you could apply to court for a decision. Generally the courts order a sale so that each party can take their share and go their own way. Which would mean that if you wanted to stay their you would need to get a mortgage to buy out your mother.
If you are named as a joint owner then you don't need to worry about contributions while you have been there. That is only relevant to someone trying to establish ownership when they are not named (eg a wife when the husband is the sole named owner).
Having said that, it might be useful if your mother attempts to argue that she has in fact paid the entire purchase price on her own. Either way, contributions to day to day costs are irrelevant. It is only contributions to the "purchase" such as mortgage payments or the cost of improvements (not maintenance) that are relevant. And if there has been nothing of this sort paid by either side since the original purchase then your mother cannot make this sort of arguement.