Does my Blade need INT?

So my new evil character blade has an intelligence of 13... is this too low? I didn't think about if it would be important until now, will she get more spell slots per level the higher her int?
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but for roleplaying purposes i wouldn't go below 15 in any case
Sure, there are plenty of useless spells that you can skip learning. There are also plenty of situational spells that you won't want constantly memorized, but will be thrilled to have when the time comes. There are only a handful of basilisks in the game, for example, but you'll be glad to have Protection from Petrification in your spell book when you encounter one.
This decision depends highly on what other casters you have in the party, and what sort of spells you'll want them to have. Since a Blade won't get higher than level 6 spells and will likely spend most of his time in the melee, having only 9 spells per level may not be an issue to you.
Then cha for reaction and int for lore and spells... you dont need wisdom since you will not use wish.
I just rolled in 5 minutes a 18 18 16 15 10 18 .. so is easy with bard