Luckily, she made it just in time, before anyone saw her.

Once Frisk set off on their own, Toriel felt an overwhelming sense of anxiety and newfound purpose. She couldn't stand the thought of anything happening to Frisk, and so she made a decision. It was time to leave the comfort of the Ruins and venture through Snowdin Forest, to ensure Frisk's safety. But the weather's whims didn't align with her plans. The moment she stepped out, a raging blizzard bore down upon her. Toriel was not prepared for the harshness of the elements, especially the wild gusts of freezing wind that forcefully reached beneath her large, robe-like clothing. It tugged at her garments, now and then lifting the thick material up, revealing the shivering form beneath. Toriel gripped her robes tightly, pushing against the blustering winds, reminding herself of her purpose -- to protect Frisk. As she finally made it to Snowdin Town, the merciless weather brought along one last forceful gust. It was a fierce and ruthless wind gust, stronger than anything she had encountered. Try as she might to secure her robes, they were ripped right off, leaving Toriel standing, her ivory fur coat now her only layer of clothing against the freezing cold. A wave of embarrassment washed over Toriel, but she couldn't allow herself the time to dwell on it. Frisk was her priority. With bare feet padding against the cold, unforgiving ground, Toriel mustered her remaining courage and kept her determination. She sprinted through Snowdin Town, towards the safer regions of Waterfall, her mind filled with one single thought – to find Frisk and ensure their safety in this seemingly unwelcoming world of monsters and meddling winds.