I don’t think Tinkermomma works out timeline wise anyway. Assuming Belle is the same age as Snow, Belle would already be a young girl in 303.
Unless all fairies are immortal and never age.
Tink was still a fairy in 303 at the time Belle would’ve been a little girl. Tink didn’t realise she was on her second chance which makes me think she hadn’t done anything serious before then otherwise she would’ve known.