Inexperience

All that Ash could do in her present situation was to make use of what was available.

The Tonfa would only help her for so long when used against Spirits of lower grades so there would be a need to get a Spirit Weapon that could assist her.

There were still some problems related to relying on such weapons since they would still get in the way of her Life Energy usage during combat.

They could greatly reduce the danger involved and help to assist her in hunting Spirits but they would restrict her personal growth.

Despite there being several advantages and disadvantages to using such tools to assist her in combat, it was slightly better for Ash to learn more so that she would have more to rely on.

If she ever ran out of Life Energy in the middle of combat then there would be times when she would have to rely on a tool to protect herself or to finish the fight.