As a Landlord myself, I would not dream of entering the property I rent to my tenants, without asking permission and agreeing a mutually suitable time. Your Landlord should not be entering your home without permission and this should be stated in your contract.
Even if it is her property, she should at least respect her tenants' privacy. If she want's to do an inspection, then she should give you at least 2 weeks notice of her desire to do so. Again, it will come down to what is in your contract, which should be read carefully before you sign.