I would say just keep playing her & not worry about the tier discussion right now. Lab it up & grind hard with her & then see what you have. Don't get too caught up into what other people say because they tend to change & they may not know something that you do (unless it's someone who is actually extremely knowledgeable at the game). Opinions are definitely welcomed in tier discussions, but the more facts that are brought to the table, the further along the discussion will go. If she is considered low tier, it doesn't necessarily mean that they're "terrible". I know this sounds like it's sugarcoating, but it really isn't. There's a barrier in the game that creates a gap in between the stronger characters & then the weaker characters. That determines the viability of the characters.
In DOA5, everyone can win. Everyone is actually decent. It's just some characters are designed to be stronger & some of them are designed for players to actually put in more work. It's in every game. Look at GG. Not that it's DOA, but Jam is a character in GG Revelator & she's considered weak. Yet, she's very decent once you learn her & can compete with anyone. She may struggle in the match (On paper), but when a good player is using her, it's much harder to actually fight her than sitting & talking from a theoretical standpoint. Now, people don't feel that she's as weak as she was led on to be at 1st.
So yeah, if you like her just keep rolling with her. Honestly, if you had more players who were character specialist (playing only their true mains instead of more than 1 or 2), then you would have way more to discuss for each character, but you don't so you can only do what you can.